T-Mobile Services SMS Delivery Issue

What to do

• Check whether you use Duo Security SMS Message Delivery, SMS Message Delivery, SMS Message Delivery, SMS Message Delivery and 63 more in us. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 3h 53m it lasted.

  Anything that failed between 2025-08-26 06:29 UTC and 2025-08-26 10:21 UTC may need a replay.

• Subscribe to Duo Security's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=duo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Duo Security 4

1. investigatingAug 26, 2025, 6:29 AM UTC

   We are currently investigating an issue affecting SMS delivery to phone numbers using T-Mobile Services in the US. Please feel free to check back here or subscribe to updates for the latest information regarding any changes or resolutions.

   provider

2. identifiedAug 26, 2025, 8:02 AM UTC

   We have detected the issue affecting SMS delivery to phone numbers using T-Mobile Services in the US. Please feel free to check back here or subscribe to updates for the latest information regarding any changes or resolutions.

   provider

3. monitoringAug 26, 2025, 8:14 AM UTC

   We are starting to see recovery post the fix implemented by our service provider for the issue affecting SMS delivery to phone numbers using T-Mobile Services in the US. Please feel free to check back here or subscribe to updates for the latest information regarding any changes or resolutions.

   provider

4. resolvedAug 26, 2025, 10:21 AM UTC

   Duo has confirmed that the issue affecting SMS delivery to phone numbers using T-Mobile services in the US has been fully resolved.

   provider

Corrections

None so far.

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