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A cellular outage on Thursday hit thousands of AT&T users in the United States, disrupting calls and text messages as well as emergency services in major cities including San Francisco.
More than 73,000 incidents were reported around 8:15 a.m.
ET, according to data from outage tracking website Downdetector.com.
AT&T said some of its customers were facing interruptions and it was "working urgently" to restore service. "We encourage the use of Wi-Fi calling until service is restored," it said.
The AT&T outage has impacted people's ability to reach emergency services by dialing 911, a post on social media platform X from the San Francisco Fire Department said.
"We are aware of an issue impacting AT&T wireless customers from making and receiving any phone calls (including to 911)," the fire department said on the platform.
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Downdetector showed users of Verizon, T-Mobile and UScellular also faced disruptions.
But T-Mobile and Verizon said their network was operating normally and the outage was potentially related to customers trying to connect other networks.
