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

        Incident Report for Twilio

        Update

        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.
        Posted May 13, 2026 - 00:00 PDT

        Update

        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.
        Posted May 12, 2026 - 16:00 PDT

        Update

        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.
        Posted May 12, 2026 - 11:59 PDT

        Monitoring

        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.
        Posted May 12, 2026 - 09:58 PDT

        Identified

        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.
        Posted May 12, 2026 - 08:58 PDT

        Update

        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.
        Posted May 12, 2026 - 06:55 PDT

        Update

        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.
        Posted May 11, 2026 - 22:55 PDT

        Update

        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.
        Posted May 11, 2026 - 18:49 PDT

        Monitoring

        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.
        Posted May 11, 2026 - 16:43 PDT

        Update

        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.
        Posted May 11, 2026 - 16:31 PDT

        Update

        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.
        Posted May 11, 2026 - 12:31 PDT

        Update

        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.
        Posted May 11, 2026 - 10:30 PDT

        Identified

        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.
        Posted May 11, 2026 - 09:27 PDT

        Investigating

        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.
        Posted May 11, 2026 - 09:04 PDT
        This incident affects: CARRIER NETWORK (Voice, North America).