200mb free for life plan: Devices have no data service, but can go to tmobile.com

I got the same message as well and my number vanished from the login page.

The only thing I can think of is that they finally followed up with their policy of deactivating the number if you didn't connect to the internet for some specified amount of time (1-3 months?) I remember reading this detail long time ago and kept my tablet as a clock going for a long time. But last year I re-arranged my room and I have no clue what I did to it. So the power probably run out, and now Tmobile run out too.