# SendGrid: SMS Delivery Delays from a Subset of Twilio Short Codes to Cellularone United States

- Impact (vendor’s label): minor
- Status: monitoring · edited after publishing
- Started: 2026-10-21 17:10 UTC · Resolved: not resolved · Duration: ongoing
- Updates: 4 · Affected components: CARRIER NETWORK - SMS Short Code, North America, SMS Short Code, North America
- [Vendor status page: https://stspg.io/d5d07rxmhypd](https://stspg.io/d5d07rxmhypd)
- [Company: SendGrid](https://rewindex.com/company/sendgrid.md)

## Timeline of updates

- **investigating** 2026-10-21 17:10 UTC: Twilio customers may be experiencing SMS delivery delays from a subset of Twilio Short Codes to Cellularone network subscribers in the United States. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.
- **investigating** 2026-10-21 18:11 UTC: Twilio customers may be experiencing SMS delivery delays from a subset of Twilio Short Codes to Cellularone network subscribers in the United States. Our team is actively investigating this issue. We will provide another update in 2 hours or as soon as more information becomes available.
- **monitoring** 2026-10-21 20:19 UTC: We have observed a recovery in SMS delivery from a subset of Twilio Short Codes to Cellularone network subscribers in the United States and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.
- **monitoring** 2026-10-21 22:20 UTC: We have observed a recovery in SMS delivery from a subset of Twilio Short Codes to Cellularone network subscribers in the United States and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

## Rewindex changes for this incident

- 2026-10-21 18:13 UTC: [Incident updated: SMS Delivery Delays from a Subset of Twilio Short Codes to Cellularone United States](https://rewindex.com/change/r9de1f1a9d6a4a8.md)
- 2026-10-21 20:23 UTC: [Incident updated: SMS Delivery Delays from a Subset of Twilio Short Codes to Cellularone United States](https://rewindex.com/change/r6fe2c2e80ce721.md)
- 2026-10-21 22:23 UTC: [Incident updated: SMS Delivery Delays from a Subset of Twilio Short Codes to Cellularone United States](https://rewindex.com/change/r785bf65bfd8356.md)


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Canonical: https://rewindex.com/company/sendgrid/incidents/h9z2vcwym575 · Markdown: https://rewindex.com/company/sendgrid/incidents/h9z2vcwym575.md · JSON: https://rewindex.com/api/v1/companies/sendgrid/incidents/h9z2vcwym575 · Generated 2026-10-22T00:32:41.329Z