Would it be possible to install/run apps on a no longer activated Galaxy S2 or 3? I like Android but they no longer make a good alternative to the Itouch. Would I need an unlocked SIII or would a deactivated phone work?
Yes, you can use it solely over wifi. But you need to put it in airplane mode or the cellular radios will destroy the battery. You can turn on airplane mode and then turn wifi on. If you root, you may be able to permanently disable the cellular radios.