Outage in Telesign
Operator Service Alert - United States (US) - ATT Mobility (310/016;030;150;170;280;380;410;670) - 09/21/26
Resolved MinorIncident Report
Summary AI Generated
On September 21, 2026, AT&T Mobility in the United States experienced quality degradation affecting 10DLC SMS traffic, causing delays and delivery failures for messages sent to AT&T subscribers. The incident lasted approximately 9.6 hours, beginning at 2:00 PM PST. The issue was resolved by the carrier, with full SMS delivery restored and all services returning to normal operation.
Issue: US Operator - ATT Mobility (310/016;030;150;170;280;380;410;670) -10 DLC only Quality degradation
Date: 09/21/26
Start Time:14:00 PM PST
End Time: Ongoing
Summary:
We currently experience quality degradation toward United States (US) - ATT Mobility (310/016;030;150;170;280;380;410;670) -10 DLC only.
SMS messages towards these operator(s) may face delays or difficulties in delivery.
Telesign is engaged with carrier partners for updates on resolution. We'd like to apologize for any inconvenience and appreciate your patience during this service interruption.
If you have any questions, please contact support@telesign.com.
SF 01239806
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Latest Updates ( sorted recent to last )
RESOLVED
about 10 hours ago - at 09/22/2026 06:36AM
Date: 09/22/26
Start Time: 14:00 PM PST
End Time: 15:19 PM PST
We received notification that the network issues previously reported by United States (US) - ATT Mobility (310/016;030;150;170;280;380;410;670) from United States (US) have been resolved. ATT Mobility (310/016;030;150;170;280;380;410;670) 10DLC end users should no longer experience delays receiving SMS messages as all services are back to functioning properly.
On behalf of the Operator, we apologize for any inconvenience this issue may have caused. If you have additional questions, please feel free to contact support@telesign.com.
SF 01239806
INVESTIGATING
about 18 hours ago - at 09/21/2026 10:20PM
Issue: US Operator - ATT Mobility (310/016;030;150;170;280;380;410;670) -10 DLC only Quality degradation
Date: 09/21/26
Start Time:14:00 PM PST
End Time: 15:19 PM PST
Summary:
We currently experience quality degradation toward United States (US) - ATT Mobility (310/016;030;150;170;280;380;410;670) -10 DLC only.
SMS messages towards these operator(s) may face delays or difficulties in delivery.
Telesign is engaged with carrier partners for updates on resolution. We'd like to apologize for any inconvenience and appreciate your patience during this service interruption.
If you have any questions, please contact support@telesign.com.
SF 01239806
INVESTIGATING
about 19 hours ago - at 09/21/2026 09:02PM
Issue: US Operator - ATT Mobility (310/016;030;150;170;280;380;410;670) -10 DLC only Quality degradation
Date: 09/21/26
Start Time:14:00 PM PST
End Time: Ongoing
Summary:
We currently experience quality degradation toward United States (US) - ATT Mobility (310/016;030;150;170;280;380;410;670) -10 DLC only.
SMS messages towards these operator(s) may face delays or difficulties in delivery.
Telesign is engaged with carrier partners for updates on resolution. We'd like to apologize for any inconvenience and appreciate your patience during this service interruption.
If you have any questions, please contact support@telesign.com.
SF 01239806
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