Delivery Issue - SMS Verification - China

Summary

Sinch says it is investigating delivery issues towards China for SMS Verification traffic, starting 2026-11-06 02:57 UTC. Reported impact includes delayed MTs, failed MTs, missing delivery receipts and late delivery receipts. As of the latest update, the incident remains under investigation.

Written by anthropic/claude-haiku-5.5 from Sinch's own updates.

What to do

• Check whether you use Sinch SMS Verification. 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.

• Switch to another region or a fallback provider while it is open, if you have one.

  Otherwise back off retries and queue work, so you don't add load while it recovers.

• Watch Sinch's own updates; this page re-reads them every minute.

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

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

Updates from Sinch 4

1. investigatingNov 6, 2026, 5:05 AM UTC

   We are currently observing delivery issues towards China for SMS Verification traffic. Incident Start Time: 2026-11-06 02:57 UTC Impact: Delayed MTs/Failed MTs/Missing delivery receipts/Late delivery receipts We will update as soon as we have more information. If you have any questions, please contact support@sinch.com.

   provider

2. investigatingNov 6, 2026, 7:01 AM UTC

   We are continuing to investigate this issue.

   provider

3. investigatingNov 6, 2026, 10:03 AM UTC

   We are continuing to investigate this issue.

   provider

4. investigatingNov 6, 2026, 3:13 PM UTC

   We are continuing to investigate this issue.

   provider

Corrections

None so far.

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