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minor✓ Resolved

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

TwilioMon, May 11, 2026, 04:04 PM
Status
resolved
Duration
2d 5h
Updates
14
Coverage
0 articles

INCIDENT TIMELINE

✓ ResolvedWed, May 13, 2026, 09:15 PM
This incident has been resolved.
monitoringWed, May 13, 2026, 07:00 AM
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.
monitoringTue, May 12, 2026, 11:00 PM
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.
monitoringTue, May 12, 2026, 06:59 PM
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.
monitoringTue, May 12, 2026, 04:58 PM
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.
identifiedTue, May 12, 2026, 03:58 PM
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.
monitoringTue, May 12, 2026, 01:55 PM
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.
monitoringTue, May 12, 2026, 05:55 AM
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.
monitoringTue, May 12, 2026, 01:49 AM
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.
monitoringMon, May 11, 2026, 11:43 PM
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.
identifiedMon, May 11, 2026, 11:31 PM
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.
identifiedMon, May 11, 2026, 07:31 PM
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.
identifiedMon, May 11, 2026, 05:30 PM
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.
identifiedMon, May 11, 2026, 04:27 PM
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.
investigatingMon, May 11, 2026, 04:04 PM
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.

📊 TECHNICAL DETAILS

Internal ID
0b19fd17-7455-4586-8db7-27a29b20988d
External ID
l7jwqcvb7v33
🕐 Started
Mon, May 11, 2026, 04:04 PM
🔄 Last Updated
Wed, May 13, 2026, 09:15 PM
✓ Resolved
Wed, May 13, 2026, 09:15 PM
MINOR
Impact Level
2d 5h
Total Duration
14
Status Updates
Affected Components
Voice, North America
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