Verizon and AT&T customers have reported their phones being stuck in SOS mode due to what appears to be a widespread outage.

Some Verizon customers have been hit by a service outage. The issue Monday appeared to knock out cellphone service for tens of thousands of people.

If you're seeing SOS mode on your phone today, you're not alone. Verizon, the largest wireless carrier in America, is experiencing a massive outage that's affecting users across the US. Around 10 a.m. ET, users reported that they could not call, text, or use cellular data. Many added that their phones were in SOS mode.

Your phone being in SOS mode is an indication that your device cannot connect to a network, but it can reach certain personnel via satellite connectivity. SOS mode is Apple's "Emergency SOS via Satellite" feature that lets users connect to satellites to reach emergency services in poor coverage areas.

Thousands of Verizon customers reported widespread outages affecting access to phone calls, text messages and cellular data Monday morning. More than 64,000 customers nationwide were affected by the outage as of 11:49 a.

Tens of thousands of people across the United States reported problems with Verizon Monday, with many unable to make or receive calls on the wireless network.

Verizon customers reported their mobile phone service wasn't working in cities across the U.S., giving them only SOS mode.

Thousands of Verizon users across the country were experiencing service outages Monday morning. More than 100,000 Verizon users had reported outages as of midday Monday, according to Downdetector. The outage tracker’s map showed hotspots near Tampa,

Verizon Wireless customers across the country reported outages Monday morning, including the Desert Southwest.