Outage in SendGrid
Voice Call Failures from a Subset of Twilio Phone Numbers to Switzerland
Resolved MinorIncident Report
Summary AI Generated
Voice calls from a subset of Twilio Toll-Free, Landline, and Mobile phone numbers to network subscribers in Switzerland (and initially other countries including the Netherlands and Iceland) failed for approximately 25 hours starting September 4, 2026. The issue affected outbound calls across multiple networks, with Twilio identifying the root cause before implementing a fix. Service was fully restored by September 5, 2026, with calls operating normally.
Twilio customers may be experiencing voice call failures from a subset of Twilio Toll-Free, Landline, and Mobile Phone Numbers to network subscribers on multiple networks in multiple countries. 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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Latest Updates ( sorted recent to last )
RESOLVED
about 4 hours ago - at 09/05/2026 10:04PM
The incident has been resolved and voice calls from a subset of Twilio Phone Numbers to network subscribers in Switzerland are operating normally.
MONITORING
about 4 hours ago - at 09/05/2026 09:40PM
We have observed a recovery in voice calls from a subset of Twilio Phone Numbers to network subscribers in Switzerland and are monitoring service stability. We will provide another update in 8 hours or as soon as more information becomes available.
MONITORING
about 9 hours ago - at 09/05/2026 05:34PM
We have observed a recovery in voice calls from a subset of Twilio Phone Numbers to network subscribers in Switzerland and are monitoring service stability. We will provide another update in 4 hours or as soon as more information becomes available.
MONITORING
about 11 hours ago - at 09/05/2026 03:28PM
We have observed a recovery in voice calls from a subset of Twilio Phone Numbers to network subscribers in Switzerland and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.
IDENTIFIED
about 18 hours ago - at 09/05/2026 08:24AM
Twilio customers may be experiencing voice call failures from a subset of Twilio Phone Numbers to network subscribers in Switzerland. 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
about 22 hours ago - at 09/05/2026 04:18AM
Twilio customers may be experiencing voice call failures from a subset of Twilio Phone Numbers to network subscribers in Switzerland. 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
about 24 hours ago - at 09/05/2026 02:18AM
Twilio customers may be experiencing voice call failures from a subset of Twilio Phone Numbers to network subscribers in Switzerland. 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
1 day ago - at 09/05/2026 01:18AM
Twilio customers may be experiencing voice call failures from a subset of Twilio Phone Numbers to network subscribers in Switzerland. 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
1 day ago - at 09/04/2026 11:56PM
Twilio customers may be experiencing voice call failures from a subset of Twilio Toll-Free, Landline, and Mobile Phone Numbers to network subscribers on multiple networks in multiple countries. Our team is actively investigating this issue. We will provide another update in 4 hours or as soon as more information becomes available.
INVESTIGATING
1 day ago - at 09/04/2026 11:18PM
Twilio customers may be experiencing voice call failures from a subset of Twilio Phone Numbers to network subscribers in the Netherlands, Switzerland, and Iceland. Our team is actively investigating this issue. We will provide another update in 4 hours or as soon as more information becomes available.
INVESTIGATING
1 day ago - at 09/04/2026 09:55PM
Twilio customers may be experiencing voice call failures from a subset of Twilio Toll-Free Numbers, Landline Numbers, and Mobile Numbers to network subscribers on multiple networks in multiple countries. Our team is actively investigating this issue. We will provide another update in 2 hours or as soon as more information becomes available.
INVESTIGATING
1 day ago - at 09/04/2026 08:55PM
Twilio customers may be experiencing voice call failures from a subset of Twilio Toll-Free, Landline, and Mobile Phone Numbers to network subscribers on multiple networks in multiple countries. 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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