i have an iphone in the uk, locked to o2. however, i'm going to be studying in france from tomorrow until may, and would like to get a french pay as you go sim card to use in it whilst i am there. the problem is, i can't take my imac. could i use pwnagetool to unlock it whilst here, then put the french sim card in after my arrival in france? my o2 sim would be in the iphone when i got to france, then i'd swap them over. is this possible, or would i need to unlock it again? any help would be VERY much appreciated!