Outage in Telesign
Quality degradation - United States (US) - ATT Mobility (310/016;030;150;170;280;380;410;670)
Resolved MinorIncident Report
Summary AI Generated
**Summary:** On August 17, 2026, Telesign experienced a quality degradation affecting SMS delivery to AT&T Mobility (10 DLC traffic only) in the United States, lasting approximately 9.8 hours. During this period, SMS messages faced delays or delivery failures for AT&T Mobility end users. The issue was resolved by 12:19 AM PST on August 18, 2026, with all services restored to normal functioning.
Issue: US Operator - ATT Mobility (310/016;030;150;170;280;380;410;670) -10 DLC only Quality degradation
Date: 08/17/26
Start Time: 5:12 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.
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Latest Updates ( sorted recent to last )
RESOLVED
about 17 hours ago - at 09/18/2026 10:33AM
Start Time: 05:12 PM PST - 08/17/26
End Time: 12:19 AM PST - 08/18/26
Quality Degradation previously reported for ATT Mobility (310/016;030;150;170;280;380;410;670) from United States (US) have been resolved. ATT Mobility end users should no longer experience delays receiving SMS messages as all services are back to functioning properly.
INVESTIGATING
1 day ago - at 09/18/2026 12:48AM
Issue: US Operator - ATT Mobility (310/016;030;150;170;280;380;410;670) -10 DLC only Quality degradation
Date: 08/17/26
Start Time: 5:12 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.
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