# Twilio in May 2021: incidents, uptime and changes

> Twilio in May 2021: 126 incidents on its status page (2 major or critical), 98.68% free of major or critical incidents (vendor-reported). From Rewindex’s archive of Twilio’s status, pricing and policy pages.

Canonical: https://rewindex.com/company/twilio/2021/05
Last updated: 2021-06-01T03:59:00Z

- Incidents posted: 126 (major/critical: 2) · Maintenance: 99
- By vendor impact label: major 2, minor 103, none 21
- Uptime (vendor-reported): 98.68% free of major/critical incidents, 19.04% free of any incident; outage time 9 h 48 min, incident time 25.1 days
- Price changes: 0 · Pricing/legal/trust page changes: 0 · Deprecations: 0 · CVEs: 0
- Previous month: [April 2021](https://rewindex.com/company/twilio/2021/04.md) · Next: [June 2021](https://rewindex.com/company/twilio/2021/06.md) · [All months](https://rewindex.com/company/twilio/reports.md) · [Twilio](https://rewindex.com/company/twilio.md)

_Uptime: Derived from the incidents the vendor posted on its own status page, not measured by us. A minute counts as an outage minute when a major or critical incident (as the vendor labelled it) was open; incident minutes include minor ones too. Maintenance and incidents marked "no impact" are left out, overlapping incidents are merged, a resolved incident counts for at most 7 days, and one still open with no resolution counts for at most 24 hours._

## Major and critical incidents

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [Super SIM Network Connectivity Issues](https://rewindex.com/company/twilio/incidents/kkl2kxhrmy1w.md) | major | 2021-05-26 07:37 UTC | 2021-05-26 14:25 UTC | 6.8 h | resolved |
| [Outbound Call Failures to Malaysia](https://rewindex.com/company/twilio/incidents/k6wygtvtxpd1.md) | major | 2021-05-28 09:07 UTC | 2021-05-28 12:07 UTC | 3.0 h | resolved |

## All incidents

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [Facebook Messenger Unable to Create New Installations](https://rewindex.com/company/twilio/incidents/tbyl52mbfbpx.md) | none | 2021-05-01 01:00 UTC | 2021-05-01 01:00 UTC | 0 min | resolved |
| [Customers Received 500 Response When Updating Phone Numbers](https://rewindex.com/company/twilio/incidents/g4g7xycb184x.md) | none | 2021-05-01 07:00 UTC | 2021-05-01 07:00 UTC | 0 min | resolved |
| [MMS Delivery Delay Over USA AT&T](https://rewindex.com/company/twilio/incidents/32znwbgcflpf.md) | minor | 2021-05-01 20:16 UTC | 2021-05-02 00:49 UTC | 4.5 h | resolved |
| [SMS Delivery Delays to Pakistan Ufone Network](https://rewindex.com/company/twilio/incidents/l6382lb36260.md) | minor | 2021-05-02 04:59 UTC | 2021-05-02 13:31 UTC | 8.5 h | resolved |
| [SMS Delivery Delays to Vodafone Network in Egypt](https://rewindex.com/company/twilio/incidents/g0n3067ps1d6.md) | minor | 2021-05-02 11:08 UTC | 2021-05-02 23:31 UTC | 12 h | resolved |
| [SMPP Connection Failure Affecting Registered Sender ID Messages to China Over Multiple Networks](https://rewindex.com/company/twilio/incidents/w9w9hfr6zp73.md) | minor | 2021-05-02 15:44 UTC | 2021-05-02 17:38 UTC | 1.9 h | resolved |
| [Delay in Account Balance Update in Twilio Platform](https://rewindex.com/company/twilio/incidents/nwsd3b1rwxln.md) | minor | 2021-05-03 01:38 UTC | 2021-05-03 02:41 UTC | 1.1 h | resolved |
| [Inbound Call and SMS Failures to a Subset of Twilio UK Phone Numbers](https://rewindex.com/company/twilio/incidents/jx54d0tzmrsh.md) | minor | 2021-05-03 13:51 UTC | 2021-05-03 15:39 UTC | 1.8 h | resolved |
| [SMS Delivery Delays from Shortcodes to Multiple US Networks](https://rewindex.com/company/twilio/incidents/dwj093dhvsvf.md) | minor | 2021-05-03 14:16 UTC | 2021-05-04 15:33 UTC | 25 h | resolved |
| [SMS Delivery Failures to UK networks](https://rewindex.com/company/twilio/incidents/n4k3ckztmkbk.md) | minor | 2021-05-03 14:42 UTC | 2021-05-03 16:21 UTC | 1.6 h | resolved |
| [SMS Delivery Delays to Orange Network in the Dominican Republic](https://rewindex.com/company/twilio/incidents/vp9xs8s6wn2c.md) | minor | 2021-05-03 17:29 UTC | 2021-05-04 20:40 UTC | 27 h | resolved |
| [Flex Customers Receiving an Error While Deploying a Plugin via the CLI](https://rewindex.com/company/twilio/incidents/mjhnbpmyyz8q.md) | minor | 2021-05-03 23:38 UTC | 2021-05-04 01:51 UTC | 2.2 h | resolved |
| [Inbound Call Failures to a Subset of Twilio Phone Numbers in Romania, Italy, Spain, Netherlands & Belgium](https://rewindex.com/company/twilio/incidents/1h2d3w80y8g4.md) | minor | 2021-05-04 08:10 UTC | 2021-05-04 11:31 UTC | 3.4 h | resolved |
| [Inbound MMS and MMS DLR Processing for USA and Canada are Failing](https://rewindex.com/company/twilio/incidents/k5sb1znjplkr.md) | minor | 2021-05-04 08:41 UTC | 2021-05-04 10:24 UTC | 1.7 h | resolved |
| [Inbound Call Issues to a Subset of Twilio UK Phone Numbers](https://rewindex.com/company/twilio/incidents/j7bqljf4g5ty.md) | minor | 2021-05-04 13:50 UTC | 2021-05-04 19:27 UTC | 5.6 h | resolved |
| [SMS Delivery Delays to Vala Network in Republic of Kosovo](https://rewindex.com/company/twilio/incidents/5m8jf3ryd382.md) | minor | 2021-05-04 15:23 UTC | 2021-05-07 20:49 UTC | 3 d | resolved |
| [On Call Engineers are Investigating Issue with Flex](https://rewindex.com/company/twilio/incidents/prpscgmgsd8z.md) | minor | 2021-05-04 18:08 UTC | 2021-05-04 18:34 UTC | 26 min | resolved |
| [SMS Delivery Report Delays For Germany T-mobile](https://rewindex.com/company/twilio/incidents/k8w9lxgl2y0w.md) | minor | 2021-05-04 19:14 UTC | 2021-05-04 20:45 UTC | 1.5 h | resolved |
| [SMS Delivery Report Delays to T-Mobile, Verizon and Sprint Networks in the US Over Subset of Short-codes.](https://rewindex.com/company/twilio/incidents/ky3bhdbfxlg6.md) | minor | 2021-05-05 00:11 UTC | 2021-05-05 01:20 UTC | 1.1 h | resolved |
| [Voice Transcriptions are Truncated](https://rewindex.com/company/twilio/incidents/vbdc9n64fgt2.md) | minor | 2021-05-05 03:55 UTC | 2021-05-05 05:31 UTC | 1.6 h | resolved |
| [SMS Delivery Delays From US Toll-Free Numbers and Short codes to Cellular Corp Network](https://rewindex.com/company/twilio/incidents/hz7nt6mxc24b.md) | minor | 2021-05-05 16:25 UTC | 2021-05-05 17:56 UTC | 1.5 h | resolved |
| [On Call Engineers are Investigating](https://rewindex.com/company/twilio/incidents/vpmy68rh4ds1.md) | none | 2021-05-05 19:37 UTC | 2021-05-05 19:57 UTC | 20 min | resolved |
| [Elevated HTTP 500 Responses for Taskrouter API](https://rewindex.com/company/twilio/incidents/c2wsppyr260k.md) | none | 2021-05-05 20:02 UTC | 2021-05-05 20:02 UTC | 0 min | resolved |
| [OneTouch Push Notifications Degradation](https://rewindex.com/company/twilio/incidents/lt1zpf0v309b.md) | none | 2021-05-05 23:27 UTC | 2021-05-05 23:27 UTC | 0 min | resolved |
| [SMS & MMS Delivery Delays to USA via Subset of Short Code to Small Subset of External Customers](https://rewindex.com/company/twilio/incidents/vh7992rdxlm2.md) | none | 2021-05-06 00:39 UTC | 2021-05-06 00:39 UTC | 0 min | resolved |
| [SMS Delivery Delay Over Libya - Libyana Mobile Phone](https://rewindex.com/company/twilio/incidents/8ns90pk88p9z.md) | minor | 2021-05-06 05:54 UTC | 2021-05-06 14:29 UTC | 8.6 h | resolved |
| [SMS Delivery Delays to Kazakhstan - K-Cell Network](https://rewindex.com/company/twilio/incidents/2dctsgj34tfx.md) | minor | 2021-05-06 12:50 UTC | 2021-05-06 16:11 UTC | 3.4 h | resolved |
| [Packet Loss Between US and Brazil Region Impacting Voice Call Quality for Subset of Customers.](https://rewindex.com/company/twilio/incidents/cq30l16jfzpp.md) | minor | 2021-05-06 20:02 UTC | 2021-05-06 20:53 UTC | 51 min | resolved |
| [SMS Delivery Delays to Guatemala - Guatemala Tigo Network](https://rewindex.com/company/twilio/incidents/7s3rslztctfw.md) | minor | 2021-05-07 08:50 UTC | 2021-05-07 11:12 UTC | 2.4 h | resolved |
| [Inbound SMS Delivery Failures on Colombia Short Codes](https://rewindex.com/company/twilio/incidents/4h0sjkzng7zm.md) | minor | 2021-05-07 17:48 UTC | 2021-05-07 20:34 UTC | 2.8 h | resolved |
| [On Call Engineers are Investigating](https://rewindex.com/company/twilio/incidents/cjb3tw4qks3k.md) | none | 2021-05-07 20:10 UTC | 2021-05-07 20:16 UTC | 6 min | resolved |
| [SMS Delivery Delay To Sierra Leone Over Airtel Network(619-01)](https://rewindex.com/company/twilio/incidents/jt7c77j61wm2.md) | minor | 2021-05-08 03:06 UTC | 2021-05-09 20:08 UTC | 41 h | resolved |
| [High AWS Packet Loss Causing Voice Failures in JP, SG and IE Regions](https://rewindex.com/company/twilio/incidents/wd4m5sc61h0d.md) | none | 2021-05-08 10:03 UTC | 2021-05-08 10:30 UTC | 27 min | resolved |
| [SMS Delivery Delays to Guatemala - Guatemala Tigo Network](https://rewindex.com/company/twilio/incidents/zsfcxj7py7zh.md) | minor | 2021-05-08 16:43 UTC | 2021-05-08 23:59 UTC | 7.3 h | resolved |
| [SMPP Connection Failure Affecting Registered Sender ID Messages to China Over Multiple Networks](https://rewindex.com/company/twilio/incidents/f6z37f8q3qfw.md) | minor | 2021-05-09 04:20 UTC | 2021-05-09 21:12 UTC | 17 h | resolved |
| [SMS Delivery Delays to Guatemala Tigo Network (704-02)](https://rewindex.com/company/twilio/incidents/l2svvw3cl4lp.md) | minor | 2021-05-09 08:17 UTC | 2021-05-09 14:15 UTC | 6.0 h | resolved |
| [\[SMS/MMS\] Delivery Report Delays to Sprint US From a Subset of Twilio Short Codes](https://rewindex.com/company/twilio/incidents/hjn2chvjdsqs.md) | minor | 2021-05-09 14:48 UTC | 2021-05-09 16:47 UTC | 2.0 h | resolved |
| [Outbound Call Failures to Australia and New Zealand](https://rewindex.com/company/twilio/incidents/nrpt98q46y55.md) | minor | 2021-05-10 01:44 UTC | 2021-05-10 02:45 UTC | 1.0 h | resolved |
| [SMS Delivery Delays to the Orange & Tigo Network in the Democratic Republic of the Congo](https://rewindex.com/company/twilio/incidents/b7z3fq48wjpr.md) | minor | 2021-05-10 21:34 UTC | 2021-05-11 07:40 UTC | 10 h | resolved |
| [Domestic SMS Delivery Delays to All Egypt Networks](https://rewindex.com/company/twilio/incidents/bvjcmfy72k3h.md) | none | 2021-05-11 13:44 UTC | 2021-05-11 13:44 UTC | 0 min | resolved |
| [Emergency Address Validation Requests Failed](https://rewindex.com/company/twilio/incidents/9z2ncp79c1kf.md) | none | 2021-05-11 13:51 UTC | 2021-05-11 13:51 UTC | 0 min | resolved |
| [SMS Delivery Report Delays when sending to Peru Claro Network](https://rewindex.com/company/twilio/incidents/hqsmvzp4vx44.md) | minor | 2021-05-11 16:34 UTC | 2021-05-11 20:52 UTC | 4.3 h | resolved |
| [Requests to Conference and Queue Resources Returning 500s](https://rewindex.com/company/twilio/incidents/yrndq49bv2hp.md) | none | 2021-05-11 17:27 UTC | 2021-05-11 18:09 UTC | 42 min | resolved |
| [SMS Delivery Delay To China Over Pre-Registered Template](https://rewindex.com/company/twilio/incidents/h09z5mn3f7b6.md) | minor | 2021-05-12 02:56 UTC | 2021-05-12 05:00 UTC | 2.1 h | resolved |
| [Usage Report Delays for Programmable Wireless](https://rewindex.com/company/twilio/incidents/k02b9dt99t7t.md) | minor | 2021-05-12 15:33 UTC | 2021-05-12 22:46 UTC | 7.2 h | resolved |
| [SMS Delivery Delays to US Cellular One from Shortcodes and Longcodes](https://rewindex.com/company/twilio/incidents/ckj6xnys9tn6.md) | minor | 2021-05-12 17:23 UTC | 2021-05-13 12:13 UTC | 19 h | resolved |
| [Verify Usage Logs Timing Out in Console](https://rewindex.com/company/twilio/incidents/6bpgtnqbv2bz.md) | minor | 2021-05-12 18:49 UTC | 2021-05-13 01:47 UTC | 7.0 h | resolved |
| [Messaging Insights Show Incorrect Aggregations](https://rewindex.com/company/twilio/incidents/cb5xc2p79djr.md) | minor | 2021-05-12 20:17 UTC | 2021-05-14 21:27 UTC | 2 d | resolved |
| [Automated Alert: Minimal Customer Impact](https://rewindex.com/company/twilio/incidents/ypbdz17k62k3.md) | none | 2021-05-12 22:25 UTC | 2021-05-12 22:30 UTC | 5 min | resolved |
| [SMS Delivery Delays to the T-Mobile Network in United States](https://rewindex.com/company/twilio/incidents/srxwh1gvbfwp.md) | minor | 2021-05-12 23:12 UTC | 2021-05-13 02:12 UTC | 3.0 h | resolved |
| [SMS Delivery Delays to the Kcell Network in Kazakhstan](https://rewindex.com/company/twilio/incidents/sf9lw8qhttdn.md) | minor | 2021-05-12 23:52 UTC | 2021-05-13 02:31 UTC | 2.6 h | resolved |
| [Inbound Call Failures to a Subset of Spain Landline Phone Numbers](https://rewindex.com/company/twilio/incidents/k4qwhq7y5k0p.md) | minor | 2021-05-13 14:02 UTC | 2021-05-14 10:23 UTC | 20 h | resolved |
| [Inbound Call Failures to Brazil Phone Numbers](https://rewindex.com/company/twilio/incidents/nh841xvz7015.md) | minor | 2021-05-13 14:10 UTC | 2021-05-13 16:16 UTC | 2.1 h | resolved |
| [SMS Delivery Reports Delays to Canada Over Short Code](https://rewindex.com/company/twilio/incidents/bjj1vm15l2jz.md) | minor | 2021-05-13 15:47 UTC | 2021-05-13 19:39 UTC | 3.9 h | resolved |
| [MMS Delivery Delays on US - T-Mobile Over a Subset of Short Codes](https://rewindex.com/company/twilio/incidents/v899vvw9lfmp.md) | minor | 2021-05-13 17:04 UTC | 2021-05-13 20:13 UTC | 3.1 h | resolved |
| [Elevated HTTP 500 Errors for Group MMS](https://rewindex.com/company/twilio/incidents/mhfkqz7r4hqv.md) | minor | 2021-05-13 17:20 UTC | 2021-05-13 18:34 UTC | 1.2 h | resolved |
| [SMS Delivery Failures to Brazil Oi and Brazil Tim when Sending from Local Long Codes](https://rewindex.com/company/twilio/incidents/9skntwy87fcy.md) | minor | 2021-05-13 17:57 UTC | 2021-05-20 19:56 UTC | 7 d | resolved |
| [Flex Admin Experience Configuration Service Returning 400s](https://rewindex.com/company/twilio/incidents/9l6qxl2rqc1p.md) | minor | 2021-05-13 19:48 UTC | 2021-05-13 20:57 UTC | 1.1 h | resolved |
| [Connection Failure for Pre-Registered Template Messages to China Over Multiple Networks (460-000, 460-001, 460-011)](https://rewindex.com/company/twilio/incidents/w2grrxbfpv1q.md) | minor | 2021-05-13 20:55 UTC | 2021-05-14 06:19 UTC | 9.4 h | resolved |
| [SMS Delivery Delays to the Orange and TIGO Networks in the DRC](https://rewindex.com/company/twilio/incidents/wv04x2djjbt1.md) | minor | 2021-05-13 22:15 UTC | 2021-05-14 02:18 UTC | 4.0 h | resolved |
| [SMS Delivery Delays to T-Mobile US Over Subset of Short Codes](https://rewindex.com/company/twilio/incidents/q22jrdncxzr5.md) | minor | 2021-05-14 00:04 UTC | 2021-05-14 02:41 UTC | 2.6 h | resolved |
| [WhatsApp Sandbox Messages Not Returning Delivery Status (stuck in "Sent")](https://rewindex.com/company/twilio/incidents/b6jp6294w2cv.md) | minor | 2021-05-14 15:20 UTC | 2021-05-14 17:06 UTC | 1.8 h | resolved |
| [Voice Conference Conference Mixer Bridging was Degraded Causing One-Way Audio in Conferences](https://rewindex.com/company/twilio/incidents/wj22992spk61.md) | none | 2021-05-14 23:24 UTC | 2021-05-14 23:24 UTC | 0 min | resolved |
| [Regression for TwiML Based Emergency Calls](https://rewindex.com/company/twilio/incidents/5cv7g710yfpr.md) | minor | 2021-05-14 23:57 UTC | 2021-05-15 01:45 UTC | 1.8 h | resolved |
| [Outbound SMS Delivery Delay to CTBC Network in Brazil](https://rewindex.com/company/twilio/incidents/qhbh5bz9fgyb.md) | minor | 2021-05-15 15:30 UTC | 2021-05-16 04:33 UTC | 13 h | resolved |
| [SMS Delivery Failures to Telcel Mexico](https://rewindex.com/company/twilio/incidents/kycqddmtyvrv.md) | minor | 2021-05-15 16:02 UTC | 2021-05-15 21:01 UTC | 5.0 h | resolved |
| [MMS Delivery Delays on US Over a Subset of Shortcodes](https://rewindex.com/company/twilio/incidents/ck561c06ysk1.md) | minor | 2021-05-15 17:01 UTC | 2021-05-16 02:54 UTC | 9.9 h | resolved |
| [SMS Delivery Delays to Peru Claro](https://rewindex.com/company/twilio/incidents/0ckjj7k67jps.md) | minor | 2021-05-15 17:03 UTC | 2021-05-15 21:55 UTC | 4.9 h | resolved |
| [SMS Delivery Delays to Zain Saudi Arabia](https://rewindex.com/company/twilio/incidents/yc7pzm7qb61z.md) | minor | 2021-05-16 08:46 UTC | 2021-05-16 16:20 UTC | 7.6 h | resolved |
| [Inbound Calls Failure for a Subset of Landline Numbers in Brazil](https://rewindex.com/company/twilio/incidents/33pyznprfl23.md) | minor | 2021-05-16 14:50 UTC | 2021-05-16 19:08 UTC | 4.3 h | resolved |
| [Packet Loss in Brazil Region Impacting Inbound Voice Call Quality for Subset of Customers](https://rewindex.com/company/twilio/incidents/r21vkph1h17f.md) | minor | 2021-05-17 13:07 UTC | 2021-05-17 17:51 UTC | 4.7 h | resolved |
| [Error Opening Verify Details Log Page in Console](https://rewindex.com/company/twilio/incidents/d62zcyxprflq.md) | none | 2021-05-17 21:16 UTC | 2021-05-17 21:16 UTC | 0 min | resolved |
| [Automated Alert: Minimal Customer Impact for Subset of SIP Calls over ORANGE OBS Missing "ForwardedFrom" Parameter.](https://rewindex.com/company/twilio/incidents/6px5jg1h925m.md) | minor | 2021-05-17 23:40 UTC | 2021-05-18 00:18 UTC | 38 min | resolved |
| [SMS Delivery Failures to Twilio Portugal Phone Numbers](https://rewindex.com/company/twilio/incidents/c2ldkmxpks5m.md) | minor | 2021-05-18 12:45 UTC | 2021-05-19 17:41 UTC | 29 h | resolved |
| [SMS Delivery Delays to Iran's Irancell Network (432-35)](https://rewindex.com/company/twilio/incidents/lg90xqt22xm1.md) | minor | 2021-05-18 21:24 UTC | 2021-05-19 01:41 UTC | 4.3 h | resolved |
| [Subset of Faxes Sent From Twilio Failing with Error “Media File Is Invalid”](https://rewindex.com/company/twilio/incidents/tcmmv9n3jsrt.md) | minor | 2021-05-18 21:54 UTC | 2021-05-18 23:05 UTC | 1.2 h | resolved |
| [SMS Delivery Delays to Digitel Venezuela (734-002)](https://rewindex.com/company/twilio/incidents/7wcbmjwt1tg8.md) | minor | 2021-05-19 02:06 UTC | 2021-05-19 02:59 UTC | 53 min | resolved |
| [Flex Conference - Unable to Transfer External Calls](https://rewindex.com/company/twilio/incidents/gq2x02zxkd9s.md) | minor | 2021-05-19 18:00 UTC | 2021-05-19 18:39 UTC | 39 min | resolved |
| [Delays for Sent and Received WhatsApp Messages](https://rewindex.com/company/twilio/incidents/q5vzqjtbgrcn.md) | minor | 2021-05-19 19:05 UTC | 2021-05-19 22:20 UTC | 3.3 h | resolved |
| [SMS Delivery Failures and Delays to Entel Peru (716-17)](https://rewindex.com/company/twilio/incidents/9rk7r9dx0c2q.md) | minor | 2021-05-19 20:23 UTC | 2021-05-20 02:11 UTC | 5.8 h | resolved |
| [SMS Delivery Delays to Entel Peru](https://rewindex.com/company/twilio/incidents/c1y0ldm0qzbj.md) | minor | 2021-05-20 07:22 UTC | 2021-05-20 16:01 UTC | 8.7 h | resolved |
| [SMS Delivery Failures from Canada Shortcodes to Canada Rogers and Telus](https://rewindex.com/company/twilio/incidents/q8l81b732r8n.md) | minor | 2021-05-20 08:14 UTC | 2021-05-20 10:02 UTC | 1.8 h | resolved |
| [Subset of Originating Elastic SIP Trunking Calls Failed](https://rewindex.com/company/twilio/incidents/v8rqn7k9nx1w.md) | none | 2021-05-20 22:00 UTC | 2021-05-20 22:00 UTC | 0 min | resolved |
| [SMS Delivery Failures to Zain Network Saudi Arabia (420-04)](https://rewindex.com/company/twilio/incidents/c9445b9vc7vq.md) | minor | 2021-05-20 22:52 UTC | 2021-05-21 01:02 UTC | 2.2 h | resolved |
| [Delay in SMS Delivery Reports to Canada](https://rewindex.com/company/twilio/incidents/r43mc8w089v3.md) | minor | 2021-05-21 10:21 UTC | 2021-05-21 15:17 UTC | 4.9 h | resolved |
| [Twilio Verify Logs Missing Data in the Console for a Subset of Customers](https://rewindex.com/company/twilio/incidents/6s7tys8fp6lj.md) | minor | 2021-05-21 15:09 UTC | 2021-05-21 20:40 UTC | 5.5 h | resolved |
| [Inbound Call Failures to Twilio Jamaican Phone Numbers](https://rewindex.com/company/twilio/incidents/fv0m53d53sqd.md) | minor | 2021-05-21 18:05 UTC | 2021-05-25 16:31 UTC | 4 d | resolved |
| [SMS Delivery Delays and Failures Sending to Movistar Network in Mexico](https://rewindex.com/company/twilio/incidents/w948pqpyf24v.md) | minor | 2021-05-22 14:13 UTC | 2021-05-22 20:05 UTC | 5.9 h | resolved |
| [SMS Delivery Delays to Cellular One in the US  from Shortcodes and Longcodes (310-320)](https://rewindex.com/company/twilio/incidents/x42lzxnxyczk.md) | minor | 2021-05-24 00:09 UTC | 2021-05-24 15:04 UTC | 15 h | resolved |
| [SMS Delivery Delays to Bluesky Samoa](https://rewindex.com/company/twilio/incidents/hytn6v057svl.md) | minor | 2021-05-24 02:50 UTC | 2021-05-26 05:15 UTC | 2 d | resolved |
| [SMS Delivery Delay to Small US Carriers Using a Subset of Shortcodes](https://rewindex.com/company/twilio/incidents/x9tqjr5xb80k.md) | minor | 2021-05-24 04:24 UTC | 2021-05-24 19:39 UTC | 15 h | resolved |
| [SMS Delivery Delays to Movistar Mexico](https://rewindex.com/company/twilio/incidents/yptt69l5znw3.md) | minor | 2021-05-24 06:27 UTC | 2021-05-24 11:13 UTC | 4.8 h | resolved |
| [SMS Delivery Failures towards Congo Airtel Network](https://rewindex.com/company/twilio/incidents/v706ht6mtj36.md) | minor | 2021-05-24 09:55 UTC | 2021-05-24 11:15 UTC | 1.3 h | resolved |
| [On Call Engineers are Investigating issues with SDK Errors](https://rewindex.com/company/twilio/incidents/rwq89h4rp4lw.md) | none | 2021-05-24 16:25 UTC | 2021-05-24 16:32 UTC | 7 min | resolved |
| [Our Engineers are Reporting a Retroactive Issue with SHAKEN/STIR Signing Failures](https://rewindex.com/company/twilio/incidents/0fw2p6hq5nh6.md) | minor | 2021-05-24 19:17 UTC | 2021-05-24 19:33 UTC | 16 min | resolved |
| [SMS Delivery Delays to MTN Network in Syria](https://rewindex.com/company/twilio/incidents/4nsrmn2sfsf0.md) | minor | 2021-05-25 02:53 UTC | 2021-05-25 05:48 UTC | 2.9 h | resolved |
| [Super SIM Network Registration Delays](https://rewindex.com/company/twilio/incidents/wfjt5wmtrbtv.md) | none | 2021-05-25 04:17 UTC | 2021-05-25 04:17 UTC | 0 min | resolved |
| [SMS Delivery Delays to Indonesia Over Indosat (510-01)](https://rewindex.com/company/twilio/incidents/nwlgcphst8qv.md) | minor | 2021-05-25 04:37 UTC | 2021-05-25 09:41 UTC | 5.1 h | resolved |
| [Programmable Wireless SIMs Stuck in Updating](https://rewindex.com/company/twilio/incidents/d8myj7k894p4.md) | minor | 2021-05-25 05:56 UTC | 2021-05-25 09:26 UTC | 3.5 h | resolved |
| [Toll-Free MMS Delivery Failures for a Subset of Twilio Numbers](https://rewindex.com/company/twilio/incidents/yp4t9p3xr3m3.md) | minor | 2021-05-25 17:38 UTC | 2021-05-26 02:45 UTC | 9.1 h | resolved |
| [SMS Delivery Delays to Tanzania Airtel Network](https://rewindex.com/company/twilio/incidents/mxgbjgbl22tb.md) | minor | 2021-05-25 19:34 UTC | 2021-05-25 22:56 UTC | 3.4 h | resolved |
| [Inbound Call Failures to a Subset of Twilio Toll-Free Phone Numbers from Turkcell](https://rewindex.com/company/twilio/incidents/bbpqb1fgk2h8.md) | minor | 2021-05-25 19:55 UTC | 2021-05-26 11:31 UTC | 16 h | resolved |
| [SMS Delivery Failures to United Kingdom - O2 Network](https://rewindex.com/company/twilio/incidents/yhyqwykgdb20.md) | minor | 2021-05-25 22:09 UTC | 2021-05-26 03:56 UTC | 5.8 h | resolved |
| [SMS Delivery Delays to Bluesky Samoa](https://rewindex.com/company/twilio/incidents/6rh4gk9kndmk.md) | minor | 2021-05-26 07:06 UTC | 2021-05-26 23:08 UTC | 16 h | resolved |
| [Super SIM Network Connectivity Issues](https://rewindex.com/company/twilio/incidents/kkl2kxhrmy1w.md) | major | 2021-05-26 07:37 UTC | 2021-05-26 14:25 UTC | 6.8 h | resolved |
| [SMS Delivery Delay to Unicom and China Mobile Network in China](https://rewindex.com/company/twilio/incidents/vfnxll2rrswp.md) | minor | 2021-05-27 05:11 UTC | 2021-05-27 14:08 UTC | 8.9 h | resolved |
| [Automated Alert: Minimal Customer Impact Incorrect Reporting of Agent Status Activity Time in TaskRouter](https://rewindex.com/company/twilio/incidents/w2wkv6mvnyjc.md) | none | 2021-05-27 13:10 UTC | 2021-05-27 15:04 UTC | 1.9 h | resolved |
| [SMS Delivery Receipt Delays on US - T-Mobile Over a Subset of Short Codes](https://rewindex.com/company/twilio/incidents/sgmc8pchrsrd.md) | minor | 2021-05-27 13:46 UTC | 2021-05-27 20:11 UTC | 6.4 h | resolved |
| [SMS Delivery Delays to Iran MTN Irancell Network](https://rewindex.com/company/twilio/incidents/zy9z5yh8jxkn.md) | minor | 2021-05-27 15:16 UTC | 2021-05-27 22:29 UTC | 7.2 h | resolved |
| [Our Engineers are Reporting a Retroactive Issue with SMS Delivery Delays to O2 Network in United Kingdom](https://rewindex.com/company/twilio/incidents/qxp9tz5m8699.md) | none | 2021-05-28 00:34 UTC | 2021-05-28 00:34 UTC | 0 min | resolved |
| [SMS Delivery Failures To Kcell Kazakhstan](https://rewindex.com/company/twilio/incidents/tzw9mw4q8wbg.md) | minor | 2021-05-28 02:42 UTC | 2021-05-28 05:57 UTC | 3.3 h | resolved |
| [SMS Delivery Failures To Telekom Networks in Malawi](https://rewindex.com/company/twilio/incidents/98p06z8mcv8w.md) | minor | 2021-05-28 05:28 UTC | 2021-05-28 10:15 UTC | 4.8 h | resolved |
| [Inbound Call Failures to a Subset of Twilio Chile Numbers](https://rewindex.com/company/twilio/incidents/hmtv0z6t63w0.md) | minor | 2021-05-28 05:35 UTC | 2021-05-28 06:27 UTC | 52 min | resolved |
| [Outbound Call Failures to Malaysia](https://rewindex.com/company/twilio/incidents/k6wygtvtxpd1.md) | major | 2021-05-28 09:07 UTC | 2021-05-28 12:07 UTC | 3.0 h | resolved |
| [Automated Alert: No Customer Impact On Call Engineers are Investigating a Potential Issue on our Platform](https://rewindex.com/company/twilio/incidents/2v3v49sd02b8.md) | none | 2021-05-28 14:12 UTC | 2021-05-28 15:31 UTC | 1.3 h | resolved |
| [Outbound Call Failures to Finland Elisa](https://rewindex.com/company/twilio/incidents/492mvb20ymlt.md) | minor | 2021-05-28 19:41 UTC | 2021-05-28 23:00 UTC | 3.3 h | resolved |
| [SMS Delivery Failures from Local Chilean Twilio Numbers to Chile Movistar](https://rewindex.com/company/twilio/incidents/cvpyv4ltslp5.md) | minor | 2021-05-28 21:45 UTC | 2021-05-29 02:29 UTC | 4.7 h | resolved |
| [MMS Delivery Delays to Verizon and AT&T in the US](https://rewindex.com/company/twilio/incidents/b5vdw4bp9sqx.md) | minor | 2021-05-28 23:25 UTC | 2021-05-29 03:22 UTC | 4.0 h | resolved |
| [On Call Engineers are Investigating](https://rewindex.com/company/twilio/incidents/31p32dvbphlm.md) | none | 2021-05-29 01:50 UTC | 2021-05-29 02:08 UTC | 18 min | resolved |
| [SMS Delivery Delays to MTN Network Nigeria](https://rewindex.com/company/twilio/incidents/g4y1lylrh734.md) | minor | 2021-05-29 21:07 UTC | 2021-05-29 22:36 UTC | 1.5 h | resolved |
| [Inbound SMS Delivery Failures from Colombia Quiubas network to Twilio Short Codes](https://rewindex.com/company/twilio/incidents/bqmgb8lvbnyn.md) | minor | 2021-05-30 07:46 UTC | 2021-05-30 23:15 UTC | 15 h | resolved |
| [On Call Engineers are Investigating a potential issue with Packet Loss in German Region](https://rewindex.com/company/twilio/incidents/j4tlq5nwp1rt.md) | minor | 2021-05-30 23:55 UTC | 2021-05-31 01:00 UTC | 1.1 h | resolved |
| [Packet Loss in German Region Caused Calls and Conferences Failed](https://rewindex.com/company/twilio/incidents/6dfrdzxqnqfj.md) | minor | 2021-05-31 02:33 UTC | 2021-05-31 03:18 UTC | 45 min | resolved |
| [SMS Delivery Delays to Syriatel and MTN Networks in Syria](https://rewindex.com/company/twilio/incidents/pn56r6pfjxy2.md) | minor | 2021-05-31 05:06 UTC | 2021-05-31 19:04 UTC | 14 h | resolved |
| [SMS Delivery Failures to Canada over Bell Mobility](https://rewindex.com/company/twilio/incidents/mbth8l8slsnv.md) | minor | 2021-05-31 12:26 UTC | 2021-06-01 03:59 UTC | 16 h | resolved |
| [SMS Delivery Delays to Movistar in Colombia](https://rewindex.com/company/twilio/incidents/7245m6cdwy3w.md) | minor | 2021-05-31 17:53 UTC | 2021-05-31 21:29 UTC | 3.6 h | resolved |

## Maintenance

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/9dctfg61zfwb.md) | maintenance | 2021-05-03 04:00 UTC | 2021-05-03 11:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] SMS Carrier Maintenance - France](https://rewindex.com/company/twilio/incidents/np4bg1bzgks4.md) | maintenance | 2021-05-03 20:00 UTC | 2021-05-04 04:00 UTC | 8.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/f5s42chhlfgt.md) | maintenance | 2021-05-03 20:00 UTC | 2021-05-04 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] SMS Carrier Maintenance - Czech Republic](https://rewindex.com/company/twilio/incidents/jfgcvflm6m2m.md) | maintenance | 2021-05-03 22:03 UTC | 2021-05-03 23:00 UTC | 57 min | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/0y40v5blnvvv.md) | maintenance | 2021-05-04 05:00 UTC | 2021-05-04 12:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/1kpr7mddgf5b.md) | maintenance | 2021-05-05 03:00 UTC | 2021-05-05 07:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] SMS Carrier Partner Maintenance - Small US Regional Carriers](https://rewindex.com/company/twilio/incidents/894fy5tm4853.md) | maintenance | 2021-05-05 04:00 UTC | 2021-05-05 09:01 UTC | 5.0 h | resolved |
| [\[Scheduled\] Mexico SMS Carrier Maintenance - Telcel](https://rewindex.com/company/twilio/incidents/60fzbw7vj36s.md) | maintenance | 2021-05-05 04:00 UTC | 2021-05-05 09:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] Mexico SMS Carrier Maintenance - Telcel Mexico](https://rewindex.com/company/twilio/incidents/1b3bptct8z31.md) | maintenance | 2021-05-05 05:00 UTC | 2021-05-05 08:30 UTC | 3.5 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance - Sprint US](https://rewindex.com/company/twilio/incidents/qy3rrrgz5zmr.md) | maintenance | 2021-05-05 05:00 UTC | 2021-05-05 11:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/r787w6ft7fm6.md) | maintenance | 2021-05-05 05:00 UTC | 2021-05-05 12:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] Singapore SMS Carrier Maintenance - M1 Singapore](https://rewindex.com/company/twilio/incidents/2lxlxn70bxpk.md) | maintenance | 2021-05-05 17:00 UTC | 2021-05-05 20:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/z944kj46jj4v.md) | maintenance | 2021-05-05 20:00 UTC | 2021-05-06 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US Toll-Free SMS & MMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/tfvhlsn3pxtk.md) | maintenance | 2021-05-06 03:00 UTC | 2021-05-06 07:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US MMS/SMS Carrier Maintenance - AT&T US](https://rewindex.com/company/twilio/incidents/6wq50l2bjbz7.md) | maintenance | 2021-05-06 04:01 UTC | 2021-05-06 11:01 UTC | 7.0 h | resolved |
| [\[Scheduled\] SMS Carrier Partner Maintenance - Small US Regional Carriers](https://rewindex.com/company/twilio/incidents/lsns0fgdczmv.md) | maintenance | 2021-05-06 04:01 UTC | 2021-05-06 09:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/r8s8fbd1g43j.md) | maintenance | 2021-05-06 05:00 UTC | 2021-05-06 12:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] Mauritius SMS Carrier Maintenance - my.t (Mauritius Telecom) Mauritius](https://rewindex.com/company/twilio/incidents/l4vsd9ynr9t9.md) | maintenance | 2021-05-06 19:00 UTC | 2021-05-06 19:30 UTC | 30 min | resolved |
| [\[Scheduled\] SMS Carrier Partner Maintenance - Small US Regional Carriers](https://rewindex.com/company/twilio/incidents/1ff3cqlx3q4z.md) | maintenance | 2021-05-07 04:00 UTC | 2021-05-07 09:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/d66sxh7f57gs.md) | maintenance | 2021-05-08 04:00 UTC | 2021-05-08 10:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] US Toll-Free SMS & MMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/w1rs1k8llvcm.md) | maintenance | 2021-05-08 04:00 UTC | 2021-05-08 10:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] The Netherlands SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/yl7nk55mcjmv.md) | maintenance | 2021-05-09 21:01 UTC | 2021-05-09 21:30 UTC | 29 min | resolved |
| [\[Scheduled\] Voice Carrier Partner Maintenance - Israel](https://rewindex.com/company/twilio/incidents/mcxxbvhbbqyf.md) | maintenance | 2021-05-10 01:01 UTC | 2021-05-10 04:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] SMS Carrier Partner Maintenance - Israel](https://rewindex.com/company/twilio/incidents/zjcwzcf42cjb.md) | maintenance | 2021-05-10 01:01 UTC | 2021-05-10 04:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance - AT&T US](https://rewindex.com/company/twilio/incidents/lnpmk81nbhym.md) | maintenance | 2021-05-10 03:00 UTC | 2021-05-10 10:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/lzwd54qchj37.md) | maintenance | 2021-05-10 03:00 UTC | 2021-05-10 10:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] US MMS/SMS Carrier Maintenance - AT&T US](https://rewindex.com/company/twilio/incidents/1152z101p9l7.md) | maintenance | 2021-05-10 04:00 UTC | 2021-05-10 11:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] Japan Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/pg3gklqps57c.md) | maintenance | 2021-05-10 15:00 UTC | 2021-05-10 19:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/hndzxgnzyj4w.md) | maintenance | 2021-05-10 20:00 UTC | 2021-05-11 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Mexico SMS Carrier Maintenance - Telcel](https://rewindex.com/company/twilio/incidents/gvzzzr1mxzqj.md) | maintenance | 2021-05-11 04:59 UTC | 2021-05-11 08:29 UTC | 3.5 h | resolved |
| [\[Scheduled\] Brazil SMS Carrier Maintenance - Claro](https://rewindex.com/company/twilio/incidents/53n4wfdwtqsq.md) | maintenance | 2021-05-11 05:00 UTC | 2021-05-11 08:20 UTC | 3.3 h | resolved |
| [\[Scheduled\] Mexico SMS Carrier Maintenance - AT&T Mexico](https://rewindex.com/company/twilio/incidents/9dnmg5r04gjz.md) | maintenance | 2021-05-11 05:00 UTC | 2021-05-11 11:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Russian Federation SMS Carrier Maintenance - Beeline(VimpelCom) Russian Federation](https://rewindex.com/company/twilio/incidents/vnj4pqv684pg.md) | maintenance | 2021-05-11 20:00 UTC | 2021-05-11 23:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] Portugal SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/sx334bjndhjt.md) | maintenance | 2021-05-12 00:00 UTC | 2021-05-12 01:00 UTC | 1.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance - AT&T US](https://rewindex.com/company/twilio/incidents/c34d4cf0frld.md) | maintenance | 2021-05-12 04:00 UTC | 2021-05-12 11:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] New Zealand SMS Carrier Maintenance-Spark Mobile](https://rewindex.com/company/twilio/incidents/7cwvqy8dwjpv.md) | maintenance | 2021-05-12 10:00 UTC | 2021-05-12 14:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/s0gb5x8b9dm8.md) | maintenance | 2021-05-12 20:00 UTC | 2021-05-13 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Russian Federation SMS Carrier Maintenance - Tele2 Russian Federation](https://rewindex.com/company/twilio/incidents/zvq45kqwzfdb.md) | maintenance | 2021-05-12 20:00 UTC | 2021-05-13 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US Toll-Free SMS & MMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/11wldpg4rvn5.md) | maintenance | 2021-05-13 03:00 UTC | 2021-05-13 07:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/gzx1wd6rpn0q.md) | maintenance | 2021-05-13 03:00 UTC | 2021-05-13 07:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance - AT&T US](https://rewindex.com/company/twilio/incidents/mvnxz9z1d5dz.md) | maintenance | 2021-05-13 04:00 UTC | 2021-05-13 11:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] Planned Maintenance for Flex Insights](https://rewindex.com/company/twilio/incidents/f1nzxxrmvyh2.md) | maintenance | 2021-05-15 08:00 UTC | 2021-05-15 10:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] Hong Kong SMS Carrier Maintenance - Hong Kong (HKT/CLS)](https://rewindex.com/company/twilio/incidents/fck93p38gbt2.md) | maintenance | 2021-05-15 22:45 UTC | 2021-05-16 00:45 UTC | 2.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/5s2z7jn3chsh.md) | maintenance | 2021-05-16 06:00 UTC | 2021-05-16 11:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] Japan SMS Carrier Maintenance - Softbank Japan](https://rewindex.com/company/twilio/incidents/75z1y9dtzdgr.md) | maintenance | 2021-05-16 16:01 UTC | 2021-05-16 21:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] Japan Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/yxnd5xf60jy6.md) | maintenance | 2021-05-17 15:00 UTC | 2021-05-17 19:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] France SMS Carrier Maintenance - Bouygues Telecom](https://rewindex.com/company/twilio/incidents/8b8s9k6cmnz2.md) | maintenance | 2021-05-17 20:01 UTC | 2021-05-18 03:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/cdhzgh5zvn5d.md) | maintenance | 2021-05-17 20:01 UTC | 2021-05-18 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] UK Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/m2cs9xj4t9jb.md) | maintenance | 2021-05-17 20:01 UTC | 2021-05-18 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Russian Federation SMS Carrier Maintenance - Beeline (VimpelCom) Russian Federation](https://rewindex.com/company/twilio/incidents/t2c3zsht72tx.md) | maintenance | 2021-05-17 21:00 UTC | 2021-05-18 02:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] UK Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/nkz0nw4v1435.md) | maintenance | 2021-05-17 23:00 UTC | 2021-05-18 03:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/jg48v9qx86s8.md) | maintenance | 2021-05-18 06:00 UTC | 2021-05-18 10:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] UK Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/ghgv1rwjm482.md) | maintenance | 2021-05-18 22:00 UTC | 2021-05-19 03:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] SMS Carrier Maintenance - O2 UK](https://rewindex.com/company/twilio/incidents/j2jfhcvvszfh.md) | maintenance | 2021-05-18 22:00 UTC | 2021-05-19 03:30 UTC | 5.5 h | resolved |
| [\[Scheduled\] Mexico SMS Carrier Maintenance - AT&T Mexico](https://rewindex.com/company/twilio/incidents/wkm178wsc2p9.md) | maintenance | 2021-05-19 05:03 UTC | 2021-05-19 11:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/w3yjbpjjzxh7.md) | maintenance | 2021-05-19 20:00 UTC | 2021-05-20 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] SMS Carrier Maintenance - Tele2 Russian Federation](https://rewindex.com/company/twilio/incidents/mbnyz6bvq2ks.md) | maintenance | 2021-05-19 20:00 UTC | 2021-05-20 02:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Russian Federation SMS Carrier Maintenance - Beeline(VimpelCom) Russian Federation](https://rewindex.com/company/twilio/incidents/phz9pnwykzwp.md) | maintenance | 2021-05-19 21:06 UTC | 2021-05-20 00:00 UTC | 2.9 h | resolved |
| [\[Scheduled\] UK Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/12qlpv7hdn8q.md) | maintenance | 2021-05-19 23:00 UTC | 2021-05-20 03:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US Toll-Free SMS & MMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/fqck37lfwx2b.md) | maintenance | 2021-05-20 03:01 UTC | 2021-05-20 07:01 UTC | 4.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/kvbktp4d777j.md) | maintenance | 2021-05-20 03:01 UTC | 2021-05-20 07:01 UTC | 4.0 h | resolved |
| [\[Scheduled\] US SMS and MMS Carrier Maintenance - AT&T US](https://rewindex.com/company/twilio/incidents/hbftfxkw1324.md) | maintenance | 2021-05-20 04:02 UTC | 2021-05-20 08:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance - T-Mobile US](https://rewindex.com/company/twilio/incidents/ccjgxl4kfthw.md) | maintenance | 2021-05-20 06:00 UTC | 2021-05-20 11:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] Japan Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/4qf9sjky519b.md) | maintenance | 2021-05-20 15:00 UTC | 2021-05-20 19:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Portugal SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/wklqdbhfcjk9.md) | maintenance | 2021-05-20 21:00 UTC | 2021-05-21 07:00 UTC | 10 h | resolved |
| [\[Scheduled\] UK Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/n68d8m5652nj.md) | maintenance | 2021-05-20 23:00 UTC | 2021-05-21 03:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Tele2](https://rewindex.com/company/twilio/incidents/8f1424nz1cld.md) | maintenance | 2021-05-20 23:00 UTC | 2021-05-21 05:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Singapore SMS Carrier Maintenance - StartHub Singapore](https://rewindex.com/company/twilio/incidents/d3pvblwnf42j.md) | maintenance | 2021-05-22 18:01 UTC | 2021-05-22 22:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Hong Kong SMS Carrier Maintenance - Hong Kong (HKT/CLS)](https://rewindex.com/company/twilio/incidents/yzf1tffxgkb1.md) | maintenance | 2021-05-22 18:01 UTC | 2021-05-22 20:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/sqwmycsqjk45.md) | maintenance | 2021-05-24 05:00 UTC | 2021-05-24 12:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] Mexico SMS Carrier Maintenance - AT&T Mexico](https://rewindex.com/company/twilio/incidents/rx5p8jyl09j2.md) | maintenance | 2021-05-24 05:00 UTC | 2021-05-24 11:01 UTC | 6.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/60dnqv61hq3x.md) | maintenance | 2021-05-24 20:00 UTC | 2021-05-25 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Brazil SMS Carrier Maintenance - Surf Telecom, Brazil](https://rewindex.com/company/twilio/incidents/rdy8fl7lvqyc.md) | maintenance | 2021-05-25 03:00 UTC | 2021-05-25 05:01 UTC | 2.0 h | resolved |
| [\[Scheduled\] Russian Federation SMS Carrier Maintenance - MTS](https://rewindex.com/company/twilio/incidents/zbt8vv22zwm8.md) | maintenance | 2021-05-25 04:00 UTC | 2021-05-25 06:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/bsyfzjwcmxqf.md) | maintenance | 2021-05-25 04:00 UTC | 2021-05-25 13:00 UTC | 9.0 h | resolved |
| [\[Scheduled\] Kazakhstan SMS Carrier Maintenance - Tele2 Kazakhstan](https://rewindex.com/company/twilio/incidents/2vfk81m44slq.md) | maintenance | 2021-05-25 05:02 UTC | 2021-05-25 08:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] Kazakhstan SMS Carrier Maintenance - Altel Kazakhstan](https://rewindex.com/company/twilio/incidents/s0llh682c402.md) | maintenance | 2021-05-25 05:02 UTC | 2021-05-25 08:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] Mexico SMS Carrier Maintenance - AT&T Mexico](https://rewindex.com/company/twilio/incidents/d9mfq92m9jz7.md) | maintenance | 2021-05-25 05:02 UTC | 2021-05-25 11:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Kazakhstan SMS Carrier Maintenance - Altel Kazakhstan](https://rewindex.com/company/twilio/incidents/kw84qsqkdbhk.md) | maintenance | 2021-05-25 20:00 UTC | 2021-05-26 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Kazakhstan SMS Carrier Maintenance - Tele2 Kazakhstan](https://rewindex.com/company/twilio/incidents/gpzpkqrl9ksh.md) | maintenance | 2021-05-25 20:00 UTC | 2021-05-26 00:01 UTC | 4.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/q9tw1c02mskd.md) | maintenance | 2021-05-25 21:00 UTC | 2021-05-25 23:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] UK SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/wcmbtjdx20yn.md) | maintenance | 2021-05-26 05:00 UTC | 2021-05-26 07:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Tele2 Russia Federation](https://rewindex.com/company/twilio/incidents/64tbj2h770fs.md) | maintenance | 2021-05-26 20:00 UTC | 2021-05-27 02:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/57cxshn0sgww.md) | maintenance | 2021-05-26 20:01 UTC | 2021-05-27 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] SMS Carrier Maintenance - Tele2, Russian Federation](https://rewindex.com/company/twilio/incidents/0q974wdh6m7k.md) | maintenance | 2021-05-26 20:01 UTC | 2021-05-27 02:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Beeline Russia Federation](https://rewindex.com/company/twilio/incidents/7zd1k3vth90p.md) | maintenance | 2021-05-26 21:03 UTC | 2021-05-27 00:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] US Toll-Free SMS & MMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/3lvcdpt2cylk.md) | maintenance | 2021-05-27 03:01 UTC | 2021-05-27 07:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] US SMS and MMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/vf66gdf0d0l5.md) | maintenance | 2021-05-27 03:02 UTC | 2021-05-27 06:59 UTC | 4.0 h | resolved |
| [\[Scheduled\] Title: Russian Federation SMS Carrier Maintenance - MTS](https://rewindex.com/company/twilio/incidents/bff2mcww3v3d.md) | maintenance | 2021-05-27 04:01 UTC | 2021-05-27 06:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance - AT&T US](https://rewindex.com/company/twilio/incidents/p4zh6sycpqs0.md) | maintenance | 2021-05-27 04:01 UTC | 2021-05-27 11:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance - T-Mobile US](https://rewindex.com/company/twilio/incidents/r0hty2tgv6kh.md) | maintenance | 2021-05-27 05:01 UTC | 2021-05-27 11:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] US MMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/0wv383f5hh6m.md) | maintenance | 2021-05-27 06:00 UTC | 2021-05-28 00:00 UTC | 18 h | resolved |
| [\[Scheduled\] US MMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/5hnl661gy9rf.md) | maintenance | 2021-05-27 06:00 UTC | 2021-05-27 13:00 UTC | 7.0 h | resolved |
| [\[Scheduled\] Singapore SMS Carrier Maintenance - StartHub Singapore](https://rewindex.com/company/twilio/incidents/p09s3vpw3zvd.md) | maintenance | 2021-05-29 18:00 UTC | 2021-05-29 22:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Indonesia SMS Carrier Maintenance - Telkomsel and XL](https://rewindex.com/company/twilio/incidents/2yq3wt9mbrh6.md) | maintenance | 2021-05-31 19:00 UTC | 2021-05-31 22:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] Pakistan SMS Carrier Maintenance - Ufone](https://rewindex.com/company/twilio/incidents/2rtrzj7xs0rz.md) | maintenance | 2021-05-31 19:00 UTC | 2021-06-01 01:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Russia SMS Carrier Maintenance - Megafon Russia](https://rewindex.com/company/twilio/incidents/17b3v8nmrbfx.md) | maintenance | 2021-05-31 20:00 UTC | 2021-06-01 00:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Russian Federation SMS Carrier Maintenance - Tele2](https://rewindex.com/company/twilio/incidents/zsc3wcygtwr1.md) | maintenance | 2021-05-31 20:00 UTC | 2021-06-01 00:01 UTC | 4.0 h | resolved |
| [\[Scheduled\] UK Voice Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/12388755z5hq.md) | maintenance | 2021-05-31 23:00 UTC | 2021-06-01 03:00 UTC | 4.0 h | resolved |

## Cite this

Twilio posted 126 status incidents in May 2021 (2 major or critical); 0 price changes and 0 notable page changes observed.

- Canonical URL: https://rewindex.com/company/twilio/2021/05
- Citation: Twilio, “Twilio in May 2021” (2021-05-01 00:00 UTC). Archived by Rewindex: https://rewindex.com/company/twilio/2021/05 (CC BY 4.0).
- Markdown link: `[Twilio: Twilio in May 2021 (2021-05-01)](https://rewindex.com/company/twilio/2021/05)`


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Canonical: https://rewindex.com/company/twilio/2021/05 · Markdown: https://rewindex.com/company/twilio/2021/05.md · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T11:03:34.865Z