Will a T mobile prepaid sim card work in a normal phone?

I have a prepaid account with Tmobile, i want to buy a cooler phone secind hand from someone i know. but i was wondering if my sim card will work in a normal phone since it is prepaid?
(for those of you who don't know, if you have t mobile you can switch phones by switching sim cards without calling in to activate it)
does anyone know if this will work?
thanks you so much:]]]