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.

Unlock baseband 4.12.09

How to Unlock Baseband 4.12.09 on iPhone 4

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:

  1. Sam unlock iPhone 4 Baseband 4.12.05, 4.12.01/02 and 4.11.08
  2. Ultrasn0w unlock iPhone 4 Baseband 1.59.00
  3. Gevey SIM unlock iPhone 4 Baseband 3.10.01, 2.10.01 and 4.10.01
  4. Factory IMEI unlock iPhone 4 Baseband 4.12.09, 4.12.05/2, 4.11.08 and all 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 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 iPhone 4 unlock

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.

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Stephan Popov
When iDevice users experience problems with the iOS software or unlocking, it is not uncommon for their lives to unravel. My passion is providing answers to your problems. I help iPhone, iPad and iPod Touch users by recommending fixes for common iOS bugs and tools that improves your experience. I conduct in-depth research for every topic i cover on this blog, to ensure that I cover everything Apple users need to troubleshoot their issues. When not writing for UnlockBoot, i enjoy swimming in my backyard pool. P.S. i prefers the Maldives for holidays. Connect with me on Facebook, Google Plus and Twitter.