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

AT&T users report issues with mobile phone and landline internet in US in addition to widespread Verizon outages. Over the last few hours reports of hundreds of outages spiked to nearly 1,500 people reporting issues texting and calling at 11 a.

More than 100,000 customers claimed to be without service as of about 11 a.m. ET, per Downdector, a website tracking tech outages reported.

Verizon users were experiencing an outage on Monday morning, causing many to see the SOS icon. Here's what it means.

Verizon services are reportedly down across the country, according to the website downdetector.com. An outage map on the site shows several spots experiencing trouble with service on Monday, Sept. 30.

Affected customers say their phones are in SOS mode. It comes as the carrier is also battling outages in the Southeast due to Hurricane Helene.

Verizon is adding satellite texting as soon as this fall, but not for all devices Phones enter SOS mode when not connected to their carrier network, either because they are in an area with poor coverage or because of a technical problem.

The Federal Communications Commission said on Monday that it was investigating a Verizon network outage across the United States after thousands of users reported outages. Chicago and Indianapolis were among the hardest-hit cities and some iPhone users were stuck in "SOS" mode.