Verizon customers across the US reported problems accessing the company’s wireless network, with some reporting Monday morning that their phones were limited to SOS service.

As of 10:15 a.m. ET, more than 70,000 reports of Verizon outages had been logged by DownDetector, a site that tracks service outages for telecommunications providers, websites and other companies.

Outages were reported from New York to Los Angeles, with the main complaint related to the lack of service on customers’ cell phones.

“SOS in Ohio since mid morning. I was on my drive to work but went out a few hours ago and haven’t come back,” one user wrote on DownDetector.

In an emailed statement to CBS MoneyWatch, Verizon said it is aware of the issue.

“We are aware of an issue impacting service for some customers,” a spokesperson said. “Our technicians are engaged and we are working quickly to identify and resolve the issue.”

What is SOS mode?

Cell phones sometimes switch to SOS mode when they have trouble connecting to a wireless network. As the name suggests, SOS mode means the phone can still make emergency calls, such as 911, by connecting to other carriers, Apple said.

–This is a developing story and will be updated.