Hi guys. I used to have ATT, with the best plan in the world. (no one should have to pay for receiving text msgs) Haven't switched the plan yet, and had a Moto v600, now a v551. (I want to throw it against the wall). I just bought a Samsung SGH-D900, haven't received yet. Just wondering if I need to do anything when I get it, as far as MMS and crap goes. I will be using the v551 SIM (its blank, how do i tell if its a 3G 64?). Any help would be appreciated.