Whenever Apple updates the firmware, the baseband gets changed sadly and users should keep updated and informed concerning the possible unlocks. At the moment, many of the free unlocks are around 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 many types of others
Unlock iPhone 4 4.12.09 baseband
Official Permanent Unlock for iPhone iPhone 4 any baseband running iOS 7
Method of Gevey SIM Unlock iPhone 4 Baseband 4.12.09
This enable you to unlock the unit, nonetheless it requires the preservation with the baseband. Custom firmware will have to be devised for iOS 7, 6.1.2, 6.1.3 or 7.1.2. But using this method only supports 3 basebands as previously mentioned.
Method of Ultrasn0w Unlock for iPhone 4 4.12.09 Baseband
Ultrasn0w is developed by MuscleNerd but it really only works with just one baseband. The version we're also talking about is 1.2.8 on the software tool.
Ultrasn0w iPhone 4 unlock
Ultrasn0w 1.2.8 unlock for iPhone 4 from Cydia store
Note: If you are an Ultrasn0w unlocker, you need to stay away from iOS 7 / 7.1.2 update should you haven’t updated till now.
Method of SAM unlock Baseband 4.12.09 iPhone 4
It has become a while considering that the SAM unlock was patched, but activation tickets can easily 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 needs to be saved in the lockdown folder, nevertheless, you can only utilize the SIM that has been used if your backup was developed. Wait for iOS 7 jailbreak in other case.
Method of factory unlock for iPhone 4 ANY Baseabnd
This is the better method definitely. After you use this approach, observe that your device is unlocked forever, and you will update to the iOS 7.1.2 / 7.2 updates later on. You can use then utilize phone on Rogers, Fido, Sprint, O2, Orange, AT&T, Telus, Telstra, Optus, Vodafone, Verizon and other popular network.
If you intend to factory unlock your iPhone 4 baseband 4.12.09 you should use a factory imei unlock service.
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