Okay no don't laugh but my entire life I have only had a prepay flip phone which I use very sparingly. My wife has an I phone which she also uses sparingly (like 10% of her GB). She wanted o upgrade and add me . A friend gave me her Samsung Galaxy 4 which she used sparingly before getting another. We were told by the AT&T salesman that could not use that because it is proprietary to Verizon. Is this the case?