Now you can permanently unlock your iPhone 4, and iPhone 3GS by using IMEI unlock method. This is a new remote unlocking method which will allow you to unlock your iPhone 4, and iPhone 3GS on any baseband using the IMEI of the iPhone. For this you don’t need to jailbreak your iPhone. As we know Ultrasn0w can not unlock iPhone 3G, 3GS on baseband 05.14.xx, 05.15.xx and 05.16.xx but using IMEI unlock method you can unlock your iPhone 3G, 3GS on baseband 05.14.xx, 05.15.xx and 05.16.xx.
Now We have Four Methods To Unlock Our iPhone
Method 1: Ultrasn0w
This is the most public method available for iPhone unlocking. As you know Ultrasnow working is based on iPhone basebands (01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00) these basebands can be unlocked using Ultrasnow. It is to remind you that a jailbroken iPhone is required to install Ultrasnow on your device.
Unfortunately Ultrasn0w doesn’t support the latest basebands (02.10.04 / 03.10.01 / 04.10.01 / 05.14.02 / 05.15.04) and we still waiting for the lastest Ultrasnow by the Dev-team that will unlock all above mentioned basebands.
Method 2: Gevey SIM
In this method you have to use a special SIM and call at 112 emergency number to get your phone activated, which might be illegal in some countries. Moreover it does not support all firmwares and basebands So it only unlock iPhone 4 running iOS 4.1 and 4.2.1 basebands 2.10.04 and 3.10.01. You will found troubles on following some steps on every reboot to get the signals of unsupported carrier. In contrast to Ultrasnow, you also have to pay few bucks to get it.
Method 3: Rebel Micro Sim Card.
Rebel Micro Sim Card may be similar to Gevey SIM, Rebel Sim can unlocks iPhone 4 basebands 1.59.00 / 03:10.01 / 02.10.04 / 04.10.01 running iOS 4, iOS 4.1, 4.2, 4.2.1, 4.3 & 4.3.1. The Rebel Micro Sim developer may be trying to solve the Gevey sim Problems
Rebel Micro Is like an Untethered Jailbreak means if you reboot your iPhone so you don’t have to do the procedure again and again. The signals will come up automatically.
It costs GBP 40 for Rebel Pro and GBP 30 for Rebel Lite. We don't know more about the that sim or the sim problems cause it sill new sim
Method 4: IMEI unlock
@MuscleNerd the well -established online unlockers for other cellphone brands are suddenly today selling iphone unlocks..obviously something opened up
@Chronic iPhone is being repaired now so can’t test, but I know @CutYourSim is legit thru past dealings. I’m positive his unlock offerings are legit.
Notes: that IMEI unlock method is an official iPhone unlock so it does not affect your warranty status.
price of IMEI unlock method: is almost thrice as compared to GEVEY SIM ranging between $150 to $200 USD.
If you don’t want to pay money for unlock then you can wait for the free Ultrasn0w unlock.