India, July 28 -- T-Mobile is experiencing a nationwide outage, with thousands of users across the United States reporting service disruptions. Many customers say their phones have switched to SOS mode, leaving them unable to make calls or use mobile data.

See the outage map here.

According to Downdetector, reports of the outage began surging around 4:30 p.m. EDT on Monday. Users from across the United States, including California, New Jersey, Washington, Utah, Florida, Minnesota, and New York, reported issues ranging from a complete loss of signal to mobile internet outages.

One user reported, "SOS here in northern UT for about 5 minutes."

Another wrote, "Why is my phone in sos in Melbourne fl what is going on I just joined this comp...