Hello guys, I was having rebooting and recovery mode issues with my factory unlocked iPhone 4S ( MD237LL ) and went to the Apple store today and they decided to replace it, after leaving the store I noticed the model of the new phone was MC924LL which I found thru google is the AT&T version, I went back to the store and was told that even though the model was not the same the phone would still be factory unlocked, they guaranteed me it was the same thing, I'm going to try a sim card from Tmobile but in the meantime what do you guys think??....