Hello. I took my non-3g iphone to the genius bar to get it replaced, because the sound is really low. I don't know what happened. I took it to the store without a sim card, because i had it unlocked. Before I took it, I restored it to original factory settings. So the lady took my iphone to the back and said yes there was a problem with it and she would replace it, but she said she would replace it when i come back. she printed out a paper and it said "customer should come back to the store with their original SIM card in order to proceed with a replacement." now my problem is... i'm t-mobile and i don't have a an iphone SIM. any suggestions on what I can do? borrow someone's iphone sim? or what..... please help.