Telnyx incident

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

Minor Resolved

Telnyx experienced a minor incident on September 15, 2026, lasting 2d 18h. The incident has been resolved; the full update timeline is below.

Started
Sep 15, 2026, 09:57 PM UTC
Resolved
Sep 18, 2026, 04:26 PM UTC
Duration
2d 18h
Detected by Pingoru
Sep 15, 2026, 09:57 PM UTC

Update timeline

  1. investigating Sep 15, 2026, 09:57 PM 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.

  2. monitoring Sep 16, 2026, 09:57 PM 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. resolved Sep 18, 2026, 04:26 PM 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.