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Outage in Twilio

SMS Delivery Delays and Failures to Viettel in Vietnam

Resolved Minor
March 22, 2026 - Started 14 days ago - Lasted about 6 hours
Official incident page

Incident Report

Summary AI Generated

Twilio experienced SMS delivery delays and failures when sending messages to Viettel customers in Vietnam, affecting their SMS service in the APAC region. The issue was caused by problems with their carrier partner connection to the Viettel network. The incident lasted 5.4 hours before engineers successfully resolved the delivery issues.

We are experiencing SMS delivery delays when sending messages to Viettel in Vietnam. Our engineers are working with our carrier partner to resolve the 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 13 days ago - at 03/22/2026 12:54PM

This incident has been resolved.

INVESTIGATING 14 days ago - at 03/22/2026 10:31AM

We are experiencing SMS delivery delays when sending messages to Viettel in Vietnam. Our engineers are working with our carrier partner to resolve the issue. We will provide another update in 4 hours or as soon as more information becomes available.

INVESTIGATING 14 days ago - at 03/22/2026 08:30AM

We are experiencing SMS delivery delays when sending messages to Viettel in Vietnam. Our engineers are working with our carrier partner to resolve the issue. We will provide another update in 2 hour or as soon as more information becomes available.

INVESTIGATING 14 days ago - at 03/22/2026 07:29AM

We are experiencing SMS delivery delays when sending messages to Viettel in Vietnam. Our engineers are working with our carrier partner to resolve the issue. We will provide another update in 1 hour or as soon as more information becomes available.

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