[coolwata34]

hey all, im pretty new to the whole iphone thing. i own a sidekick3 and its dead. im supposed to be getting a used iphone tom i belive its a 2g. ive done some reading through out some sites, and well they guy who owned it had it activated under at*t but now he doesnt use it(i beleave he has a diffrent phone now) do i need to activate it through itunes, or can i go ahead and start the processs of unlocking it so i can put it on my tmobile network?
thanks for the help i know im a newbie and u guys have probally seen plenty of questions similar to this