Outage in Twilio

SMS Delivery Delays and Failures from a Subset of Twilio Long Codes and Alphanumeric Sender IDs to MobiFone Vietnam

Resolved Minor

March 12, 2026 - Started about 11 hours ago - Lasted about 4 hours
Official incident page

Incident Report

Summary AI Generated

Twilio experienced SMS delivery delays and failures for messages sent from a subset of Long Codes and Alphanumeric Sender IDs to MobiFone network subscribers in Vietnam. The issue affected SMS services in the APAC region for 3.5 hours. Twilio's team identified the root cause and restored normal SMS delivery operations to the affected network.

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

Components affected

Twilio SMS, APAC

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Latest Updates ( sorted recent to last )

RESOLVED about 8 hours ago - at 03/12/2026 09:09PM

The incident has been resolved and SMS delivery from a subset of Twilio Long Codes and Alphanumeric Sender ID to MobiFone network subscribers in Vietnam is operating normally.

MONITORING about 10 hours ago - at 03/12/2026 07:14PM

We have observed a recovery in SMS delivery from a subset of Twilio Long Codes and Alphanumeric Sender IDs 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.

IDENTIFIED about 10 hours ago - at 03/12/2026 06:35PM

Twilio customers may be experiencing SMS delivery delays and failures from a subset of Twilio Long Codes and Alphanumeric Sender IDs to MobiFone network subscribers in Vietnam. Our team has identified the cause, and continues working to resolve the issue. We will provide another update in 2 hour or as soon as more information becomes available.

IDENTIFIED about 11 hours ago - at 03/12/2026 05:41PM

Twilio customers may be experiencing SMS delivery delays and failures from a subset of Twilio Long Codes and Alphanumeric Sender IDs to MobiFone network subscribers in Vietnam. 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.

INVESTIGATING about 11 hours ago - at 03/12/2026 05:40PM

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