Telnyx incident: SMS Delivery — Encoding Issues on Outbound Messages to T-Mobile

1. resolvedSep 18, 2026, 16:26 UTC

   Our downstream partner's fix for garbled message bodies on 10DLC SMS to T-Mobile destinations has been confirmed. Impact was limited to 10DLC senders assigned to 501(c)(3) tax-exempt campaigns. Both test and live traffic to T-Mobile destinations are delivering intact. An RCA will follow.

2. monitoringSep 16, 2026, 21:57 UTC

   Our downstream partner has deployed a fix for garbled message bodies on 10DLC SMS to T-Mobile destinations. The issue impacted 10DLC senders assigned to 501(c)(3) tax-exempt campaigns predominantly. Test messages to T-Mobile destinations are now delivering intact.

3. investigatingSep 15, 2026, 21:57 UTC

   We are currently investigating reports of encoding issues affecting a subset of outbound SMS messages to T-Mobile. End users may be receiving messages with garbled or unreadable text. We are actively investigating with our downstream partner and will provide an update as soon as we have more information.

What APIStatus.watch saw

Our 5-minute checks didn't record a change in Telnyx's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

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How often does Telnyx have incidents?

Telnyx reported 23 incidents in the last 90 days, 14 of them major or critical. A typical incident lasted 2h 2m. See Telnyx's uptime and incident history