Twilio incident

SMS Delivery Delays and Failures from a Subset of Twilio Phone Numbers to China Mobile Hong Kong

Minor Resolved View vendor source →

Twilio experienced a minor incident on May 21, 2026 affecting SMS, APAC, lasting 6h 18m. The incident has been resolved; the full update timeline is below.

Started
May 21, 2026, 05:27 AM UTC
Resolved
May 21, 2026, 11:45 AM UTC
Duration
6h 18m
Detected by Pingoru
May 21, 2026, 05:27 AM UTC

Affected components

SMS, APAC

Update timeline

  1. investigating May 21, 2026, 05:27 AM UTC

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

  2. identified May 21, 2026, 05:28 AM UTC

    Twilio customers may be experiencing SMS delivery delays and failures from a subset of Twilio Phone Numbers to China Mobile network subscribers in Hong Kong. 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.

  3. monitoring May 21, 2026, 05:43 AM UTC

    We have observed a recovery in SMS delivery from a subset of Twilio Phone Numbers to China Mobile network subscribers in Hong Kong and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

  4. monitoring May 21, 2026, 07:43 AM UTC

    We have observed a recovery in SMS delivery from a subset of Twilio Phone Numbers to China Mobile network subscribers in Hong Kong and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

  5. monitoring May 21, 2026, 11:45 AM UTC

    We have observed a recovery in SMS delivery from a subset of Twilio Phone Numbers to China Mobile network subscribers in Hong Kong and are monitoring service stability. We will provide another update in 8 hours or as soon as more information becomes available.

  6. resolved May 21, 2026, 11:45 AM UTC

    The incident has been resolved and SMS delivery from a subset of Twilio Phone Numbers to China Mobile network subscribers in Hong Kong is operating normally.