Does any sim work in an iphone 3gs?

My phone is broken, friend says that I could have her old IPhone, would my current sim work in it?

Only the regular large sim cards. Nano sim and Micro sim will NOT fit. And of course the sim has to be active with your phone carrier. The Sim card for a iPhone 4 or iPhone 5 will not fit.

Depending on if the 3GS is able to work with your SIM's carrier or if it is unlocked.