# Voice Call Failures From a Subset of Twilio Mobile Numbers to Argentina

- Provider: [Twilio](https://down.guide/providers/twilio)
- Confidence: Confirmed
- Impact: Degraded
- lasted 1d 9h
- started 2026-11-05 18:34 UTC
- Voice, Latin America
- id: DWN-69a8508807
- Official page: https://stspg.io/t4vp65pctxst

## Summary
Voice call failures affected a subset of Twilio Mobile Numbers calling network subscribers in Argentina, with Telefonica subscribers named in some updates. The provider says the incident is resolved and voice calls are operating normally as of 2026-11-07 03:55 UTC.

_Written by anthropic/claude-haiku-5.5 from Twilio's own updates._

## Updates from Twilio
### 2026-11-05 18:34 UTC: investigating
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to network subscribers in Argentina. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.

### 2026-11-05 19:12 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to Telefonica network subscribers in Argentina. 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.

### 2026-11-05 20:13 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to Telefonica network subscribers in Argentina. 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.

### 2026-11-05 22:15 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to network subscribers in Argentina. 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.

### 2026-11-06 02:21 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Mobile Numbers to Telefonica network subscribers in Argentina. 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.

### 2026-11-06 10:22 UTC: identified
Twilio customers may be experiencing voice call failures from a subset of Twilio Phone Numbers to network subscribers in Argentina. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 16 hours or as soon as more information becomes available.

### 2026-11-06 21:52 UTC: monitoring
We have observed a recovery in voice calls from a subset of Twilio Phone Numbers to network subscribers in Argentina and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

### 2026-11-06 23:53 UTC: monitoring
We have observed a recovery in voice calls from a subset of Twilio Mobile Numbers to network subscribers in Argentina and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.

### 2026-11-07 03:55 UTC: resolved
The incident has been resolved and voice calls from a subset of Twilio Mobile Numbers to network subscribers in Argentina are operating normally.

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