Most of our regular readers are well-versed about the fact that iPhone 4 baseband 4.12.09 on iOS 7.0.4 / 7.1 / 7.1.2 firmware is quite famous for unlocking.
We have covered a lot about it already, but we need to inform you more about the IMEI factory unlock that is available for iPhone 4 baseband 4.12.09 on iOS 7.1, 7.0 and 7.1 firmware.
Free Unlocking Compatible Basebands
Whenever Apple updates the firmware, the baseband gets changed sadly and users need to keep updated and informed about the possible unlocks. At the moment, some of the free unlocks are available for the following basebands:
- Sam unlock iPhone 4 Baseband 4.12.05, 4.12.01/02 and 4.11.08
- Ultrasn0w unlock iPhone 4 Baseband 1.59.00
- Gevey SIM unlock iPhone 4 Baseband 3.10.01, 2.10.01 and 4.10.01
- Factory IMEI unlock iPhone 4 Baseband 4.12.09, 4.12.05/2, 4.11.08 and all others
Official Permanent Unlock for iPhone iPhone 4 any baseband running iOS 7
Method of Gevey SIM Unlock iPhone 4 Baseband 4.12.09
This can be used to unlock the device, but it requires the preservation of the baseband. Custom firmware will need to be created for iOS 7, 6.1.2, 6.1.3 or 7.1.2. But this method only supports 3 basebands as mentioned before.
Method of Ultrasn0w Unlock for iPhone 4 4.12.09 Baseband
Ultrasn0w has been developed by MuscleNerd but it only works with a single baseband. The version we are talking about is 1.2.8 of the software tool.
Ultrasn0w 1.2.8 unlock for iPhone 4 from Cydia store
Note: If you are an Ultrasn0w unlocker, you should stay away from iOS 7 / 7.1.2 update if you haven’t updated till now.
Method of SAM unlock Baseband 4.12.09 iPhone 4
It has been a while since the SAM unlock was patched, but activation tickets can still work to unlock iPhone 4 compatible basebands on iOS 7.1.2 / 7.0.4 / 6.1.2, 6.1.3 and below. The tickets should be saved in the lockdown folder, but you can only use the SIM that was used when the backup was created. Wait for iOS 7 jailbreak in other case.
Method of factory unlock for iPhone 4 ANY Baseabnd
This is the best method by far. After you use this method, note that your device is unlocked forever, and you can update to any iOS 7.1.2 / 7.2 updates in the future. You can use then use the phone on Rogers, Fido, Sprint, O2, Orange, AT&T, Telus, Telstra, Optus, Vodafone, Verizon or any other popular network.
If you want to factory unlock your iPhone 4 baseband 4.12.09 you need to use a factory imei unlock service.