hi im new here but my iphone 4 broke and i do not have insurance so to make a long story short i bought one off ebay....but it turns out it is a verizon model and im on att(i found this out the hard way when i went to put my sim in and i found no sim slot:/ )...am i just out of luck or do you think the apple store if i explained my problem would let me exchange the verizon model for a used at&t model? i spent 400 dollars on this phone i cant afford another one :[