I am really loving my 521 except its not a huge, high powered device. I go into the AT&T store with envy everytime i see this device on display and wish it was on T-Mobile. I had AT&T in the past and was miserable with them. Anyways, i wish this was on T-Mobile's network or at least have Nokia release a new Lumia device with a 5.2inch - 5.4inch screen. For T-Mobile of course!