i have 2 questions:

Q1: when i get the activation sim card, do i activate it online and pay with a prepaid ToGo card? I want to get prepaid but idk how to do it. once i activate it do i just go to the store and buy a t-mobile card? please explain...

Q2: Phones like the MyTouch and the Sidekick aren't prepaid. All i have to do is unlock them to use them as prepaid phones?