Outage in Zipwhip
SMS Delivery Receipt Delays from a Subset of Twilio Alphanumeric Numbers to T-Mobile Czech Republic
Resolved MajorIncident Report
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.
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Latest Updates ( sorted recent to last )
RESOLVED
about 6 hours ago - at 05/19/2026 10:54PM
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.
MONITORING
about 8 hours ago - at 05/19/2026 08:59PM
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.
IDENTIFIED
about 9 hours ago - at 05/19/2026 07:58PM
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.
IDENTIFIED
about 11 hours ago - at 05/19/2026 05:56PM
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
about 12 hours ago - at 05/19/2026 04:55PM
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.
INVESTIGATING
about 12 hours ago - at 05/19/2026 04:51PM
We are continuing to investigate this issue.
INVESTIGATING
about 12 hours ago - at 05/19/2026 04:48PM
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.
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