T-Mobile is down across the United States, and many iPhone users are seeing “SOS” in their device’s status bar. Here’s everything you need to know about today’s T-Mobile outage.

T-Mobile is down, iPhones in ‘SOS’ mode

Data aggregated by Downdetector shows that the T-Mobile outage began right around 4 p.m. ET/1 p.m. PT. The outage appears to be widespread, with users across the United States reporting problems with their service.

A thread on Reddit has amassed thousands of complaints from T-Mobile subscribers who say they are unable to place calls, send texts, and use cellular data on their devices. There are also thousands of complaints from T-Mobile users on other social networks.

Several of us here at 9to5Mac are also impacted by the T-Mobile outage and are unable to use any cellular networking features on our iPhones.