Twilio incident

SMS Delivery Receipt Delays From a Subset of Twilio Long Codes and Toll-Free Numbers to Viaero United States

Minor Resolved View vendor source →

Twilio experienced a minor incident on May 21, 2026 affecting SMS Toll-Free, North America, lasting 18h 50m. The incident has been resolved; the full update timeline is below.

Started
May 21, 2026, 10:59 PM UTC
Resolved
May 22, 2026, 05:50 PM UTC
Duration
18h 50m
Detected by Pingoru
May 21, 2026, 10:59 PM UTC

Affected components

SMS Toll-Free, North America

Update timeline

  1. investigating May 21, 2026, 10:59 PM UTC

    Twilio customers may be experiencing SMS delivery delays from a subset of Twilio Long Codes and Toll-Free Numbers to Viaero network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 1 hour or as soon as more information becomes available.

  2. identified May 21, 2026, 11:55 PM UTC

    Twilio customers may be experiencing SMS delivery delays from a subset of Twilio Long Codes and Toll-Free Numbers to Viaero network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 2 hours or as soon as more information becomes available.

  3. identified May 22, 2026, 01:51 AM UTC

    Twilio customers may be experiencing SMS delivery delays from a subset of Twilio Long Codes and Toll-Free Numbers to Viaero network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 4 hours or as soon as more information becomes available.

  4. identified May 22, 2026, 05:49 AM UTC

    Twilio customers may be experiencing SMS delivery delays from a subset of Twilio Long Codes and Toll-Free Numbers to Viaero network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 8 hours or as soon as more information becomes available.

  5. identified May 22, 2026, 01:54 PM UTC

    Twilio customers may be experiencing SMS delivery delays from a subset of Twilio Long Codes and Toll-Free Numbers to Viaero network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 16 hours or as soon as more information becomes available.

  6. monitoring May 22, 2026, 03:50 PM UTC

    We are observing recovery in SMS delivery delays from a subset of Twilio Long Codes and Toll-Free Numbers to Viaero network subscribers in the United States. We will continue monitoring the service to ensure a full recovery. We will provide another update in 1 hour or as soon as more information becomes available.

  7. resolved May 22, 2026, 05:50 PM UTC

    We are no longer experiencing SMS delivery delays when sending messages to Viaero. This incident has been resolved.