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Outage in Twilio

Voice Call Audio Quality Degradation between a Subset of Twilio United States Phone Numbers and T-Mobile in United States

Resolved Minor
May 11, 2026 - Started 29 days ago - Lasted 2 days
Official incident page

Incident Report

Summary AI Generated

Twilio customers experienced voice call audio quality degradation between a subset of Twilio US phone numbers and T-Mobile network subscribers in the United States for 53.1 hours. The issue affected Twilio's Voice service in North America, with multiple periods of apparent recovery followed by recurrence. The incident was ultimately resolved with voice calls returning to normal operation.

Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. 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 Voice, North America

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Latest Updates ( sorted recent to last )
RESOLVED 26 days ago - at 05/13/2026 09:11PM

The incident has been resolved and voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States are operating normally.

MONITORING 27 days ago - at 05/13/2026 07:00AM

We have observed a recovery in voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 16 hours or as soon as more information becomes available.

MONITORING 27 days ago - at 05/12/2026 11:00PM

We have observed a recovery in voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 8 hours or as soon as more information becomes available.

MONITORING 27 days ago - at 05/12/2026 06:59PM

We have observed a recovery in voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

MONITORING 28 days ago - at 05/12/2026 04:58PM

We have observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

IDENTIFIED 28 days ago - at 05/12/2026 03:58PM

Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. 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.

MONITORING 28 days ago - at 05/12/2026 01:55PM

We have observed a recovery in voice calls between a subset of Twilio United States Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 16 hours or as soon as more information becomes available.

MONITORING 28 days ago - at 05/12/2026 05:55AM

We have observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 8 hours or as soon as more information becomes available.

MONITORING 28 days ago - at 05/12/2026 01:49AM

We have observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

MONITORING 28 days ago - at 05/11/2026 11:43PM

We have observed a recovery in voice calls between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

IDENTIFIED 28 days ago - at 05/11/2026 11:31PM

Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 8 hours or as soon as more information becomes available.

IDENTIFIED 28 days ago - at 05/11/2026 07:31PM

Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 4 hours or as soon as more information becomes available.

IDENTIFIED 29 days ago - at 05/11/2026 05:30PM

Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 2 hours or as soon as more information becomes available.

IDENTIFIED 29 days ago - at 05/11/2026 04:27PM

Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. 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 29 days ago - at 05/11/2026 04:04PM

Twilio customers may be experiencing voice call audio quality degradation between a subset of Twilio Phone Numbers and T-Mobile network subscribers in the United States. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.

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