Gevey SIM unlock
As soon as iPhone Dev-Team failed to produce an updated version of ultrasn0w that can unlock newer basebands, a Chinese hacker team called Gevey found a working solution which can actually unlock several basebands of the iPhone 4 / 4S and iPhone 5.
What exactly is a Gevey SIM?
Unlike a ultrasn0w unlock, Gevey SIM hack is not a software based hack as it requires you to buy a SIM interposer which sits electrically between the SIM card and baseband hardware to perform a classical MITM (man in the middle attack). In order to stay unlocked, you ALWAYS need to keep that SIM interposer in-between your SIM card and iPhone baseband hardware.
What do you need to know before you buy a Gevey SIM unlock:
- It works if your network handles 112 calls properly according to the GSM standard.
- If your network validates your IMSI (Temporary Mobile Subscriber Identity) on every incoming call, do not buy a Gevey SIM.
- Even if your network do not validates your IMSI on every incoming call, you still have to revalidate your IMSI if your iPhone loses power, loses the reception or move to another PLMN (Public land mobile network). In all of these cases, your TMSI expires and has to be obtained again.
- Not all 3G networks will work, for example you will not see T-mobile with 3G service on the iPhone but you will see it working with edge.
- SIM interposer will not harm your iPhone hardware but it can get your account banned from your network provider if they knew that you have spoofed your IMSI and ICCID. Its only in China that GSM companies know this loophole but still don’t bother to close it.
- The only way to permanently unlock your iPhone is through a factory unlock.
Here’s a basic video tutorial of how the Gevey Sim unlock works: