Hey guys, I'm about to buy myself an Iphone from the US and well I want to unlock it but before buying a turbosim or a clone of it I want to understand how it works... Does it exploit a bug in the iphone or does it clone the AT&T card? How does it work? I'm wondering this because I want to know if a future update could make this solution stop working... And also as the TurboSim is re-programmable is it possible that another technique is found if they block the current one? (not sure what it is..)... Finally, I saw some comments that some of the cheap knockoff could drain your battery or lower the stability of the OS is that true?

Thanks in advance,
Looking forward to learn more on this...