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Mobile phone transmitter mast with dark clouds in the sky

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If you are waking up to an SOS mode on your cell phone, you’re not alone.

According to, over 30,000 outage incidents were reported with AT&T’s service around 4:30 a.m. ET.

Impacted cities included Charlotte, Honolulu, San Francisco, Houston and Chicago, the website showed.

Large swathes of the U.S. were hit by a cellular outage early on Thursday, with thousands of users reporting disruptions with the services offered by telecom firms including AT&T, Verizon and T-Mobile.

In SOS mode, the cellular phones are only able to access 911.

“Some of our customers are experiencing wireless service interruptions this morning. We are working urgently to restore service to them. We encourage the use of Wi-Fi calling until service is restored,” AT&T said in a statement.

It’s not clear what is causing the problem or when it will be fixed.