Twilio incident
SMS Delivery Receipt Delays from a Subset of Twilio Alphanumeric Numbers to T-Mobile Czech Republic
Twilio experienced a major incident on May 19, 2026 affecting SMS, APAC and MMS, APAC and 1 more component, lasting 6h 6m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating May 19, 2026, 04:48 PM UTC
Twilio customers may be experiencing MMS 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.
- investigating May 19, 2026, 04:51 PM UTC
We are continuing to investigate this issue.
- identified May 19, 2026, 04:55 PM UTC
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.
- identified May 19, 2026, 05:56 PM UTC
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.
- identified May 19, 2026, 07:58 PM UTC
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.
- monitoring May 19, 2026, 08:59 PM UTC
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.
- resolved May 19, 2026, 10:54 PM UTC
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.