Voice Call Audio Quality Degradation from T-Mobile United States to a Subset of Twilio United States Phone Numbers

Resolved

Twilio customers experienced voice call audio quality degradation from T-Mobile network subscribers in the United States to a subset of Twilio United States Phone Numbers from 08:20 PDT 03/18/2026 to 9:30 PDT 03/19/2026. The issue has been resolved.