Outage in Prelude
SMS deliverability in China is highly degraded
Resolved Minor
September 30, 2026 - Started 6 days ago
- Lasted 2 days
Incident Report
We are investigating SMS delivery issues in China.
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Latest Updates ( sorted recent to last )
MONITORING
6 days ago - at 09/30/2026 11:35AM
SMS verification messages to mainland China are now being sent in English, including when Chinese is selected. We have also added a new delivery route for China. Delivery and conversion rates have returned to normal levels, and we are continuing to monitor them.
Verification messages are not yet available in Chinese, so service remains degraded while we work to restore Chinese-language messages.
MONITORING
6 days ago - at 09/30/2026 10:25AM
SMS delivery to Chinese phone numbers remains degraded. We have made changes to how affected messages are sent and are monitoring delivery rates to see whether they improve.
INVESTIGATING
6 days ago - at 09/30/2026 09:40AM
We are investigating SMS delivery issues in China.
Latest Prelude outages
Increased latencies and error rates on the Verify API - about 2 months ago
WhatsApp Delivery Disruption - 4 months ago
Degraded performance on our Verify API - 4 months ago
Latencies on Prelude Dashboard - 4 months ago
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