SMS Delivery Delays and Failures to China Unicom in China

Incident Report for Twilio

Resolved

China SMS is a Twilio Best Effort destination. We will continue investigation, however resolve the status post per the information in the following post:
https://www.twilio.com/en-us/guidelines/cn/sms

Posted Dec 04, 2025 - 16:21 PST

Investigating

We are experiencing SMS delivery delays and failures when sending messages to China Unicom in China. 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.

Posted Dec 04, 2025 - 14:54 PST

This incident affected: CARRIER NETWORK (SMS, APAC).