Hi! i just got from us.. and my uncle gave me his brandnew iphone 6 (at&t and still in contract) as a present, we went to the apple store, he bought it as an upgrade but kept his old cellphone for himself and gave the newone.. he didnt even put the sim card in the new one.. I already tried to unlock it and the guy told me he couldnt do it and gave me my money back.. and somewhere around here i read it couldnt be done without first activating it with and at&t simcard.. is that true? is there anything i can do?