February 22, 2024 AT&T Mobility Network Outage Report and Findings

A report detailing the cause and impact of a nationwide AT&T wireless service outage on February 22, 2024, that lasted at least 12 hours and prevented customers from using voice and data services, including blocking more than 92 million phone calls and more than 25,000 attempts to reach 911. Key findings include:

• The outage affected users in all 50 states as well as Washington, D.C., Puerto Rico, and the U.S. Virgin Islands. All voice and 5G data services for AT&T wireless customers were unavailable, affecting more than 125 million devices, blocking more than 92 million voice calls, and preventing more than 25,000 calls to 911 call centers.
• Voice and 5G data services were unavailable to customers of other wireless providers that regularly use or were roaming on AT&T’s network.
• It took AT&T at least 12 hours to fully restore service.
• The outage also cut off service to devices operated by public safety users of the First Responder Network Authority (FirstNet). AT&T prioritized the restoration of FirstNet before other services but did not notify FirstNet customers of the outage until three hours after it began, and nearly one hour after service was restored.
• The incident began after AT&T implemented a network change with an equipment configuration error.