SendGrid incident: SMS Delivery Delays and Failures from a Subset of Twilio Alphanumeric Sender IDs to Mobile China

Affected components

• SMS, APAC

1. resolvedOct 23, 2026, 03:55 UTC

   The incident has been resolved and SMS delivery from a subset of Twilio Alphanumeric Sender ID's to China Mobile network subscribers in China is operating normally.

2. monitoringOct 9, 2026, 15:35 UTC

   We have completed our investigation and determined that this event did not result in any customer impact. All systems are operating normally.

3. identifiedOct 9, 2026, 14:31 UTC

   Twilio customers may be experiencing SMS delivery delays and failures from a subset of Twilio Alphanumeric Sender Type to Mobile network subscribers in China. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 8 hours or as soon as more information becomes available.

4. identifiedOct 9, 2026, 10:25 UTC

   Twilio customers may be experiencing SMS delivery delays and failures from a subset of Twilio Alphanumeric Sender Type to China Mobile network subscribers in China. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 4 hours or as soon as more information becomes available.

5. identifiedOct 9, 2026, 08:05 UTC

   Twilio customers may be experiencing SMS delivery delays and failures from a subset of Twilio Alphanumeric Sender Type to Mobile network subscribers in China. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 2 hours or as soon as more information becomes available.

6. identifiedOct 9, 2026, 07:05 UTC

   Twilio customers may be experiencing SMS delivery delays and failures from a subset of Twilio Alphanumeric Sender IDs to China Mobile network subscribers in China. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 1 hour or as soon as more information becomes available.

7. investigatingOct 9, 2026, 06:42 UTC

   Twilio customers may be experiencing SMS delivery delays and failures from a subset of Twilio Alphanumeric Sender IDs to China Mobile network subscribers in China. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.

What APIStatus.watch saw

• Oct 20, 2026, 12:30 UTCoperational → unknown
• Oct 20, 2026, 12:35 UTCunknown → operational
• Oct 21, 2026, 14:26 UTCoperational → unknown
• Oct 21, 2026, 14:31 UTCunknown → operational
• Oct 22, 2026, 13:31 UTCoperational → unknown
• Oct 22, 2026, 13:36 UTCunknown → operational

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