http://compass.t-mobile.com/

"The T-Mobile Personal Coverage Check is currently unavailable. Please try back again shortly."

I tried it early this morning at 7am and images were broken, now they added this message.
I could only hope/wish they were updating the maps but who knows.

I've checked on and off comparing old images saved to new ones displayed there and the last time that map was updated nationally was February 15th.