SMS Delivery Report Delays from a Subset of Alphanumeric Sender IDs to MobiFone Vietnam

Incident Report for Twilio

Resolved

We are no longer experiencing SMS delivery delays from a subset of alphanumeric Sender IDs to MobiFone network subscribers in Vietnam. This incident has been resolved.

Posted Mar 27, 2026 - 00:44 PDT

Monitoring

We have observed a recovery in SMS delivery receipts from a subset of Twilio Alphanumeric Senders to MobiFone network subscribers in Vietnam and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

Posted Mar 26, 2026 - 22:40 PDT

Update

Twilio customers may be experiencing SMS delivery receipt delays from a subset of Twilio Alphanumeric Senders to MobiFone network subscribers in Vietnam. 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.

Posted Mar 26, 2026 - 22:39 PDT

Update

Twilio customers may be experiencing SMS delivery receipt delays from a subset of Twilio Alphanumeric Senders to MobiFone network subscribers in Vietnam. 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.

Posted Mar 26, 2026 - 18:39 PDT

Update

Twilio customers may be experiencing SMS delivery receipt delays from a subset of Twilio Alphanumeric Senders to MobiFone network subscribers in Vietnam. 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.

Posted Mar 26, 2026 - 16:39 PDT

Identified

Twilio customers may be experiencing SMS delivery receipt delays from a subset of Twilio Alphanumeric Senders to MobiFone network subscribers in Vietnam. 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.

Posted Mar 26, 2026 - 15:29 PDT

Investigating

Twilio customers may be experiencing SMS delivery report delays from a subset of alphanumeric Sender IDs to MobiFone network subscribers in Vietnam. Message delivery may succeed, but delivery receipts may be delayed. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.

Posted Mar 26, 2026 - 15:03 PDT

This incident affected: CARRIER NETWORK (SMS, APAC).