SMS Delivery Receipt Delays from a Subset of Twilio Alphanumeric Numbers to T-Mobile Czech Republic

Incident Report for Twilio

Resolved

The incident has been resolved and SMS delivery receipts from a subset of Twilio Alphanumeric Numbers to T-Mobile network subscribers in the Czech Republic are operating normally.

Posted May 19, 2026 - 15:54 PDT

Monitoring

We have observed a recovery in SMS delivery receipts from a subset of Twilio Alphanumeric Numbers to T-Mobile network subscribers in the Czech Republic and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.

Posted May 19, 2026 - 13:59 PDT

Update

Twilio customers may be experiencing SMS delivery receipt delays from a subset of Twilio Alphanumeric Sender IDs to T-Mobile network subscribers in the Czech Republic. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 4 hours or as soon as more information becomes available.

Posted May 19, 2026 - 12:58 PDT

Update

Twilio customers may be experiencing SMS delivery receipt delays from a subset of Twilio Alphanumeric Numbers to T-Mobile network subscribers in the Czech Republic. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 2 hours or as soon as more information becomes available.

Posted May 19, 2026 - 10:56 PDT

Identified

Twilio customers may be experiencing SMS delivery receipt delays from a subset of Twilio Alphanumeric Sender IDs to T-Mobile network subscribers in the Czech Republic. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 1 hour or as soon as more information becomes available.

Posted May 19, 2026 - 09:55 PDT

Update

We are continuing to investigate this issue.

Posted May 19, 2026 - 09:51 PDT

Investigating

Twilio customers may be experiencing SMS delivery receipt delays from Twilio to T-Mobile network subscribers in the Czech Republic. Our team is actively investigating this issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 1 hour or as soon as more information becomes available.

Posted May 19, 2026 - 09:48 PDT

This incident affected: CARRIER NETWORK (SMS, Europe).