i know there are three different types of iphone 5, att,verizon, and international, and i also know that verizon's iphone 5 come unlocked but my question is which version is better? i dont care about lte or 4g etc i just want 3g and does cricket iphone 5 use a nano sim? because verizon iphone 5 does, so if i buy an verizon iphone can i use it in cricket? thanks