# Twilio in December 2019: incidents, uptime and changes

> Twilio in December 2019: 36 incidents on its status page (2 major or critical), 99.60% 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/2019/12
Last updated: 2020-01-01T00:00:00Z

- Incidents posted: 36 (major/critical: 2) · Maintenance: 16
- By vendor impact label: critical 1, major 1, minor 27, none 7
- Uptime (vendor-reported): 99.60% free of major/critical incidents, 73.59% free of any incident; outage time 2 h 55 min, incident time 8.2 days
- Price changes: 0 · Pricing/legal/trust page changes: 0 · Deprecations: 0 · CVEs: 0
- Previous month: [November 2019](https://rewindex.com/company/twilio/2019/11.md) · Next: [January 2020](https://rewindex.com/company/twilio/2020/01.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 |
| --- | --- | --- | --- | --- | --- |
| [Alert trigger emails and webhooks failing to send](https://rewindex.com/company/twilio/incidents/vx10wc9rj6df.md) | critical | 2019-12-20 01:59 UTC | 2019-12-20 04:15 UTC | 2.3 h | resolved |
| [Inbound Call Failures to Phone Numbers in El Salvador](https://rewindex.com/company/twilio/incidents/749nblrh4qq5.md) | major | 2019-12-18 05:04 UTC | 2019-12-18 05:43 UTC | 39 min | resolved |

## All incidents

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [Stale data in the Twilio Flex Supervisor Views](https://rewindex.com/company/twilio/incidents/m20gqg6hw7fh.md) | none | 2019-12-01 02:05 UTC | 2019-12-01 02:05 UTC | 0 min | resolved |
| [Outbound delivery failures to Israel](https://rewindex.com/company/twilio/incidents/tbgpvbmt3wmh.md) | minor | 2019-12-01 18:07 UTC | 2019-12-02 06:27 UTC | 12 h | resolved |
| [Outbound SMS Delivery degradation to UK Vodafone numbers](https://rewindex.com/company/twilio/incidents/2mbqrt7xbnmf.md) | minor | 2019-12-02 11:05 UTC | 2019-12-02 13:56 UTC | 2.9 h | resolved |
| [MMS delivery delays to US Operators](https://rewindex.com/company/twilio/incidents/twhghw7152r8.md) | minor | 2019-12-02 16:25 UTC | 2019-12-03 06:33 UTC | 14 h | resolved |
| [Short Code SMS Delays for Messages Sent from Sprint devices](https://rewindex.com/company/twilio/incidents/kznrjc2wxccq.md) | minor | 2019-12-03 16:47 UTC | 2019-12-04 00:17 UTC | 7.5 h | resolved |
| [Toll-Free delivery degradation towards T-Mobile USA](https://rewindex.com/company/twilio/incidents/1lt9bdmbzgv9.md) | minor | 2019-12-05 07:02 UTC | 2019-12-05 09:41 UTC | 2.6 h | resolved |
| [Difficulties upgrading accounts for countries: Russia, Ukraine, Bosnia](https://rewindex.com/company/twilio/incidents/gpj2rwyrz2bm.md) | minor | 2019-12-05 12:43 UTC | 2019-12-05 14:22 UTC | 1.6 h | resolved |
| [SC and LC SMS Delivery Degradation to and from US numbers](https://rewindex.com/company/twilio/incidents/k8czy97xjj46.md) | minor | 2019-12-05 16:44 UTC | 2019-12-05 18:45 UTC | 2.0 h | resolved |
| [Some customers are experiencing intermittent 500 errors to the OutgoingCallerIds Endpoint](https://rewindex.com/company/twilio/incidents/jrmvxj6tqymf.md) | minor | 2019-12-06 22:12 UTC | 2019-12-06 23:00 UTC | 48 min | resolved |
| [SMS Delivery Degradation toward Hormuud Somalia](https://rewindex.com/company/twilio/incidents/hnxv1t4544b7.md) | minor | 2019-12-08 19:03 UTC | 2019-12-09 04:04 UTC | 9.0 h | resolved |
| [HTTP 500 Errors while closing subaccount.](https://rewindex.com/company/twilio/incidents/70btrxk1c96n.md) | minor | 2019-12-10 20:50 UTC | 2019-12-10 21:09 UTC | 19 min | resolved |
| [On Call Engineers are Investigating](https://rewindex.com/company/twilio/incidents/9q8r3h7xykyt.md) | none | 2019-12-11 01:07 UTC | 2019-12-11 01:22 UTC | 15 min | resolved |
| [SMS Delivery Degradation Towards Verizon US](https://rewindex.com/company/twilio/incidents/hbmd9s320yjw.md) | minor | 2019-12-11 08:21 UTC | 2019-12-11 09:38 UTC | 1.3 h | resolved |
| [SMS delivery degradation towards Bouygues, France](https://rewindex.com/company/twilio/incidents/d1glb65fl1g2.md) | minor | 2019-12-11 14:20 UTC | 2019-12-11 18:06 UTC | 3.8 h | resolved |
| [SMS Delivery Degradation Towards Airtel India](https://rewindex.com/company/twilio/incidents/sfkqwpbtp0mc.md) | minor | 2019-12-12 03:01 UTC | 2019-12-12 04:48 UTC | 1.8 h | resolved |
| [Issues provisioning regulated numbers for KDDI customers](https://rewindex.com/company/twilio/incidents/xx9crvrbvfhb.md) | minor | 2019-12-12 08:27 UTC | 2019-12-12 12:18 UTC | 3.9 h | resolved |
| [Issues provisioning regulated numbers](https://rewindex.com/company/twilio/incidents/9837bfrn8bzq.md) | minor | 2019-12-12 14:51 UTC | 2019-12-13 04:38 UTC | 14 h | resolved |
| [SMS Service Degradation towards Peru Claro.](https://rewindex.com/company/twilio/incidents/jqfn176bhc5d.md) | minor | 2019-12-13 22:03 UTC | 2019-12-14 01:45 UTC | 3.7 h | resolved |
| [SMS Delivery Delay for Claro Brazil.](https://rewindex.com/company/twilio/incidents/2bxztl6sygks.md) | minor | 2019-12-15 23:19 UTC | 2019-12-15 23:49 UTC | 30 min | resolved |
| [On Call Engineers are Investigating](https://rewindex.com/company/twilio/incidents/zj9v59fvrkp3.md) | none | 2019-12-16 21:37 UTC | 2019-12-17 00:19 UTC | 2.7 h | resolved |
| [On Call Engineers are Investigating](https://rewindex.com/company/twilio/incidents/l4hzxj0l4xc2.md) | none | 2019-12-16 22:49 UTC | 2019-12-17 03:21 UTC | 4.5 h | resolved |
| [SMS Delivery Degradation Towards U-Mobile Malaysia](https://rewindex.com/company/twilio/incidents/fc9f4gxzz1jb.md) | minor | 2019-12-17 05:05 UTC | 2019-12-17 10:17 UTC | 5.2 h | resolved |
| [A subset of Outbound Calls with one-way audio issue in Mexico](https://rewindex.com/company/twilio/incidents/bdz37j35phvw.md) | minor | 2019-12-17 06:27 UTC | 2019-12-17 13:09 UTC | 6.7 h | resolved |
| [Inbound Call Failures to Phone Numbers in El Salvador](https://rewindex.com/company/twilio/incidents/749nblrh4qq5.md) | major | 2019-12-18 05:04 UTC | 2019-12-18 05:43 UTC | 39 min | resolved |
| [Errors when purchasing numbers in Console for some users](https://rewindex.com/company/twilio/incidents/8twy13jzd160.md) | none | 2019-12-19 00:28 UTC | 2019-12-19 03:57 UTC | 3.5 h | resolved |
| [Partial delay in SMS delivery to some of the US carriers (except Verizon).](https://rewindex.com/company/twilio/incidents/rddv8sv1cqwy.md) | none | 2019-12-19 13:48 UTC | 2019-12-19 13:48 UTC | 0 min | resolved |
| [Alert trigger emails and webhooks failing to send](https://rewindex.com/company/twilio/incidents/vx10wc9rj6df.md) | critical | 2019-12-20 01:59 UTC | 2019-12-20 04:15 UTC | 2.3 h | resolved |
| [SMS Delivery Degradation Towards Telenor Pakistan](https://rewindex.com/company/twilio/incidents/cf67rknd0rdf.md) | minor | 2019-12-20 07:25 UTC | 2019-12-20 11:17 UTC | 3.9 h | resolved |
| [Inbound SMS Delivery Delays to Subsets of US Numbers](https://rewindex.com/company/twilio/incidents/s5jlvvwlfm88.md) | none | 2019-12-20 16:55 UTC | 2019-12-20 16:55 UTC | 0 min | resolved |
| [SMS Delivery Degradation Toward AT&T US (311-180) via A Subset of ShortCodes](https://rewindex.com/company/twilio/incidents/9v5v2xy957xd.md) | minor | 2019-12-22 03:29 UTC | 2019-12-22 08:47 UTC | 5.3 h | resolved |
| [SMS Delivery Degradation Towards MTN Afghanistan](https://rewindex.com/company/twilio/incidents/sr76gbkbb8qr.md) | minor | 2019-12-23 03:30 UTC | 2019-12-23 08:59 UTC | 5.5 h | resolved |
| [SMS Delivery receipt degradation to AT&T Toll-Free Recipients in the US.](https://rewindex.com/company/twilio/incidents/smy5kdc87p6f.md) | minor | 2019-12-23 15:39 UTC | 2019-12-27 06:43 UTC | 4 d | resolved |
| [Delivery Degradation Longcode SMS Messages to and from Claro in Chile](https://rewindex.com/company/twilio/incidents/hck08sj1xf5h.md) | minor | 2019-12-24 00:40 UTC | 2019-12-24 01:37 UTC | 57 min | resolved |
| [Inbound Voice Issues for Singapore Numbers](https://rewindex.com/company/twilio/incidents/dygnppgnbkzj.md) | minor | 2019-12-24 08:14 UTC | 2019-12-24 16:49 UTC | 8.6 h | resolved |
| [SMS and DLR delays over longcode to all operators in the US](https://rewindex.com/company/twilio/incidents/hk1llpyqd50w.md) | minor | 2019-12-25 11:05 UTC | 2019-12-25 13:29 UTC | 2.4 h | resolved |
| [Message Delivery Degradation Toward Verizon](https://rewindex.com/company/twilio/incidents/vvfk9ygqmbkd.md) | minor | 2019-12-28 19:45 UTC | 2019-12-28 21:33 UTC | 1.8 h | resolved |

## Maintenance

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [\[Scheduled\] Russia SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/gflnflrwvx45.md) | maintenance | 2019-12-02 21:01 UTC | 2019-12-03 02:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] AT&T Mexico SMS Carrier Partner Maintenance](https://rewindex.com/company/twilio/incidents/kd7q5jqvdl5y.md) | maintenance | 2019-12-03 06:00 UTC | 2019-12-03 12:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] T-Mobile US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/jczmtt16rk1q.md) | maintenance | 2019-12-04 06:00 UTC | 2019-12-04 11:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] Sprint US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/k7x2pm1s99mt.md) | maintenance | 2019-12-05 05:01 UTC | 2019-12-05 11:00 UTC | 6.0 h | resolved |
| [\[Scheduled\] Flex Insights dashboards visualization partner maintenance December 7th, 2019, at 1:00-3:00 AM PDT](https://rewindex.com/company/twilio/incidents/t5jhjz1dqptj.md) | maintenance | 2019-12-07 09:00 UTC | 2019-12-07 11:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] T-Mobile US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/dfh25qss8jxb.md) | maintenance | 2019-12-09 08:00 UTC | 2019-12-09 11:00 UTC | 3.0 h | resolved |
| [\[Scheduled\] Verizon US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/jt084rf2l5vv.md) | maintenance | 2019-12-10 19:00 UTC | 2019-12-11 00:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] Megafon Russia - SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/x6cj59p8lyy2.md) | maintenance | 2019-12-10 20:00 UTC | 2019-12-11 01:00 UTC | 5.0 h | resolved |
| [\[Scheduled\] T-Mobile US SMS Carrier Maintenance.](https://rewindex.com/company/twilio/incidents/psshfbqd0czn.md) | maintenance | 2019-12-11 07:00 UTC | 2019-12-11 11:00 UTC | 4.0 h | resolved |
| [\[Scheduled\] Planned Migration to briefly Impact Phone Number Provisioning](https://rewindex.com/company/twilio/incidents/07k5thcndl2v.md) | maintenance | 2019-12-12 02:01 UTC | 2019-12-12 04:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] AT&T Mexico - SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/3vqh62k4ydzv.md) | maintenance | 2019-12-12 06:00 UTC | 2019-12-12 12:01 UTC | 6.0 h | resolved |
| [\[Scheduled\] US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/nk165twm8f06.md) | maintenance | 2019-12-17 10:00 UTC | 2019-12-17 12:00 UTC | 2.0 h | resolved |
| [\[Scheduled\] AT&T US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/dbd17prqd7ck.md) | maintenance | 2019-12-18 03:00 UTC | 2019-12-18 12:00 UTC | 9.0 h | resolved |
| [\[Scheduled\] AT&T US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/ct75wmrpwl6m.md) | maintenance | 2019-12-19 03:00 UTC | 2019-12-19 12:00 UTC | 9.0 h | resolved |
| [\[Scheduled\] T-Mobile US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/xypztv8bxcsf.md) | maintenance | 2019-12-19 07:00 UTC | 2019-12-19 07:41 UTC | 41 min | resolved |
| [\[Scheduled\] T-Mobile US SMS Carrier Maintenance](https://rewindex.com/company/twilio/incidents/mwq3l16655nc.md) | maintenance | 2019-12-19 07:00 UTC | 2019-12-19 11:01 UTC | 4.0 h | resolved |

## Cite this

Twilio posted 36 status incidents in December 2019 (2 major or critical); 0 price changes and 0 notable page changes observed.

- Canonical URL: https://rewindex.com/company/twilio/2019/12
- Citation: Twilio, “Twilio in December 2019” (2019-12-01 00:00 UTC). Archived by Rewindex: https://rewindex.com/company/twilio/2019/12 (CC BY 4.0).
- Markdown link: `[Twilio: Twilio in December 2019 (2019-12-01)](https://rewindex.com/company/twilio/2019/12)`


---
Canonical: https://rewindex.com/company/twilio/2019/12 · Markdown: https://rewindex.com/company/twilio/2019/12.md · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-05T15:30:53.383Z