# Voice Call Failures from T-Mobile United States to a Subset of Twilio United States Phone Numbers

- Provider: [Twilio](https://down.guide/twilio)
- Level: confirmed
- Impact: Degraded
- lasted 1h 39m
- started 2026-08-18 14:56 UTC
- Voice, North America
- us
- id: DWN-b1a22fcf8b
- Official page: https://stspg.io/5722tvrbgw49

## Updates from Twilio
### 2026-08-18 14:56 UTC: investigating
Twilio customers may be experiencing voice call failures from network subscribers to Twilio United States Phone Numbers. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.

### 2026-08-18 15:57 UTC: 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. 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.

### 2026-08-18 15:58 UTC: 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. 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.

### 2026-08-18 16:35 UTC: resolved
We have completed our investigation and determined that this event did not result in any customer impact. All systems are operating normally.

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