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Outage in Twilio

SMS Delivery Delays to T-Mobile US via a Subset Of Toll-Free and Longcode Numbers

Resolved Minor
December 03, 2025 - Started 5 months ago - Lasted about 15 hours
Official incident page

Incident Report

We are experiencing SMS delivery delays when sending messages to T-Mobile US via a Subset Of Toll-Free and Longcode Numbers. Our engineers are working with our carrier partner to resolve the issue. 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 5 months ago - at 12/04/2025 06:38AM

We are no longer experiencing SMS delivery delays when sending messages to T-Mobile Network in US. This incident has been resolved.

MONITORING 5 months ago - at 12/04/2025 02:39AM

We are observing recovery in SMS delivery delays when sending messages to T-Mobile Network in the US. We will continue monitoring the service to ensure a full recovery. We will provide another update in 4 hours or as soon as more information becomes available.

MONITORING 5 months ago - at 12/04/2025 12:46AM

We are observing recovery in SMS delivery delays when sending messages to T-Mobile Network in the US. We will continue monitoring the service to ensure a full recovery. We will provide another update in 2 hours or as soon as more information becomes available.

MONITORING 5 months ago - at 12/03/2025 10:46PM

We are observing recovery in SMS delivery delays when sending messages to T-Mobile Network in the US. We will continue monitoring the service to ensure a full recovery. We will provide another update in 2 hours or as soon as more information becomes available.

INVESTIGATING 5 months ago - at 12/03/2025 08:32PM

We are continuing to experience intermittent delays in message delivery to T-Mobile Network in the US due to an extended maintenance window on their side, which is temporarily impacting approximately 50% of their capacity.

Impact is expected only around the top of the hour, when traffic volumes are at their highest. Outside of these peak times, traffic is expected to process normally.

We are monitoring the situation closely and working with T-Mobile to obtain updated information during this maintenance window. We will provide another update in 4 hours or as soon as more information becomes available.

INVESTIGATING 5 months ago - at 12/03/2025 06:27PM

We are currently observing intermittent delays in message delivery to T-Mobile Network in the US due to an extended maintenance window on their side, which is temporarily impacting approximately 50% of their capacity.

Impact is expected only around the top of the hour, when traffic volumes are at their highest. Outside of these peak times, traffic is expected to process normally.

We are monitoring the situation closely and working with T-Mobile to obtain updated information during this maintenance window. We will provide another update in 2 hours or as soon as more information becomes available.

MONITORING 5 months ago - at 12/03/2025 04:40PM

We are observing recovery in SMS delivery delays when sending messages to T-Mobile US via a Subset Of Toll-Free and Longcode Numbers. We will continue monitoring the service to ensure a full recovery. We will provide another update in 2 hours or as soon as more information becomes available.

INVESTIGATING 5 months ago - at 12/03/2025 04:13PM

We continue experiencing SMS delivery delays when sending messages to T-Mobile US via a Subset Of Toll-Free and Longcode Numbers. Our engineers are working with our carrier partner to resolve the issue. We will provide another update in 2 hours or as soon as more information becomes available.

INVESTIGATING 5 months ago - at 12/03/2025 03:13PM

We are experiencing SMS delivery delays when sending messages to T-Mobile US via a Subset Of Toll-Free and Longcode Numbers. Our engineers are working with our carrier partner to resolve the issue. We will provide another update in 1 hour or as soon as more information becomes available.

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