Twilio outage on 2026-08-21: SMS Delivery Receipt Delays from a Subset of Twilio Phone Numbers to Telefonica El Salvador

Twilio customers may be experiencing SMS delivery receipt delays from a subset of Twilio Phone Numbers to Telefonica network subscribers in El Salvador. 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 24 hours or as soon as more information becomes available.