Event Monitor Cyber
EM-20261112-H38X OutageMedium severity

AT&T: Messaging Delivery Problems

Nov 12, 2026 · Carrier · reported by Sinch, Vonage, Twilio, Bandwidth

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Status
Confirmed

Since : 4 provider status pages acknowledged it.

First Signal
Nov 12 00:33 UTCT20 Sinch status
Page Born
Nov 12 01:14 UTCsecond source joined
Last Signal
Nov 12 01:32 UTC1 min before snapshot
Sources
44 official · 0 research, news or crowd
Lasted
59 minso far

Life Of This Page

  1. 1
    Born
    A second, independent provider or measurement sees it.
  2. 2
    Developing
    Reports and measurements join.
  3. 3
    Confirmed · Now
    A provider status page acknowledges it.
  4. 4
    Resolved
    Not yet
    Every provider marks it resolved and 6 hours pass quietly, or 24 hours pass with no new signal.
  5. 5
    Archived
    Not yet
    30 days after resolved. Read only; the link keeps working. Reopens if it comes back.

The ID never changes, and earlier addresses keep working. A correction is logged, never overwritten. If two pages turn out to be one incident, the later one points to the earlier.

Outage Lifecycle

  1. First Report: reached
    Nov 12 00:33 UTC
    T20 Sinch status
  2. Corroborated: reached
    Nov 12 01:14 UTC
    4 independent sources
  3. Acknowledged: reached
    Nov 12 00:33 UTC
    T20 status page
  4. Network Check: not yet
    Not yet
    No network data for this provider
  5. Restored: not yet
    Not yet
    Still open

Timeline

20:0022:00Nov 1202:0004:0006:00BornT20 Sinch statusT21 Vonage statusT17 Twilio statusT18 Bandwidth status

Point at a mark to read it. Squares are signals, colored by severity; every one is also listed under Signals.

Signals

  1. Bandwidth: AT&T SMS Delays (opens source in a new tab) investigating. Bandwidth teams are investigating delays to outbound SMS messages to AT&T destinations. Med severityProvider StatusT18 Bandwidth status
  2. Twilio: SMS Delivery Failures From Long Code Numbers to AT&T in the US (opens source in a new tab) investigating. We are experiencing SMS Delivery Failures From Long Code Numbers to AT&T in the US. Our engineers are working with our carrier partner to resolve the issue. We expect to provide another update in 1 hour… Med severityProvider StatusT17 Twilio status
  3. Vonage: USA SMS - Delivery degradation affecting 10DLC traffic towards AT&T operator (opens source in a new tab) investigating. Please be advised that we are observing SMS delivery degradation for 10dlc towards AT&T operator in USA.. We are working towards resolution of the issue and will issue an update as soon as more… Med severityProvider StatusT21 Vonage status
  4. Sinch: Delivery Issue - United States - AT&T (opens source in a new tab) investigating. We are currently observing delivery issues in United States - AT&T Incident Start Time: 2026-11-12 00:00 UTC Impact: Failed MT's/Delayed MT's/Missing delivery receipts/Late delivery receipts We will… Med severityProvider StatusT20 Sinch status