Thousands of T-Mobile customers lost service Monday afternoon, and a lot of them found out the same way. The signal bars vanished. In their place, one small word appeared at the top of the screen. SOS. Downdetector data shows the problems started around 4 p.m. ET, then climbed fast. More than 64,000 people had reported an outage by 5:15 p.m. ET, with most flagging no signal at all. Reports kept stacking up from there, eventually passing 140,000. Customers reported trouble in New York, Los Angeles, Chicago, Houston, Denver, Atlanta and across Texas, Florida and the Pacific Northwest. Prepaid brands that