The transposing SIM method to unlock the iPhone is not a new method. It begun when an Australian hacker unlocked the iPhone with a TurboSIM and hence enabled the iPhone to go on carrier other than the sole carrier. this method went underground as right after its discovery, as software unlocks for iPhone became available from Geohot and then by the iPhone Dev Team.
Another reason for this withheld is the high cost of production which prevented the manufacturer to continue the production. But whatsoever, the Gevey TurboSIM is back with a bang because this time it can unlock your iPhone 4 on basebands 02.10.04 and 03.10.01.
How does Gevy SIM Unlock Work With iPhone 4?
You might be aware of the fact that SIM cards hold some critical information relating to your carrier. One of these bits is the IMSI number which is an identification code that represents your account number and other information in the mobile carrier’s database. so in easy words, a SIM card is a client of the carrier database. when you apply the TurboSIM, it copies this information from your carrier sim and dodges your iPhone that the SIM present now is the one which has the sole carrier IMSI number.
When you insert the Gevey SIM card in your iPhone via the tray, the phone goes offline as it finds no network on it. then you dial 112 to dial an emergency call even when the phone is not connected to any network and turn the flight-mode on then the game starts with Gevey. Its interpose ROM prevents the phone baseband from detecting that the IMSI of inserted SIM is copied one. You are all done now with your iPhone which is now on carrier of your choice.
Precautions
Be sure that you have adequate knowledge of SIM insertion and working with basebands. And secondly, this type of hacks can easily be undone with a simple firmware update which Apple has already done once when the TurboSIM was initially launched. so if you are planning for a Gevey TurboSIM to unlock your iPhone 4 then make sure to keep an eye on what is being updated on your device through iTunes.
For those who find the Gevey SIM unlock expensive ($50), you may like to wait for the iPhone Dev Team to release their 40 Bit NCK hack.