I'm not on T-mobile yet but I am planning on moving on or around Oct 17, Currently I'm running bone stock 4.3 S4v2.1 with Baseband MDK. I know I need to at least update the modem to mj7 (i think). What i'm wondering is if there is a way to test it out. Can i just request a sim from them?
This is of course that i don't sell the phone