Twilio - Voice Call Failures From Network Subscribers to Twilio United States Phone Numbers

Incident Report for Ciptex

Resolved

Following comprehensive monitoring, we can confirm that the incident has been fully resolved and all services have returned to normal operation.

Posted Aug 18, 2026 - 17:38 BST

Identified

Twilio customers may be experiencing voice call failures from T-Mobile network subscribers in the United States to a subset of Twilio United States Phone Numbers. Twilio 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.

Posted Aug 18, 2026 - 17:00 BST

Update

We are continuing to investigate this issue.

Posted Aug 18, 2026 - 16:01 BST

Investigating

We have detected potential service disruption through our monitoring systems and are actively investigating. A detailed assessment of the impact and affected services will be provided within the next 30 minutes.

Posted Aug 18, 2026 - 15:58 BST