I am pretty sure I already know the answer to this but figured I would ask just to make sure. My wife has an ATT 32gb iPhone 4 and my daughter has an iPhone 4 16gb that I had unlocked (was ATT) and is now on a T-mobile prepaid plan (with a tmobile sim of course).
My question is can I take my wife's ATT (postpaid) sim and put it in my daughters phone and let my wife use it just like it was my her's....without all the apps,music ETC?
Can the sim just be swapped back and forth without changing any settings?
I assume I can since the 16gb phone is unlocked (and was ATT after all). I just can't take the tmobile sim and put it in my wife's unless I unlock it first, right?