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How to Use Ultrasn0w to Unlock iPhone 4 on iOS 4.3.5?

Hi, I’m a new iPhone 4 user and right now what I want to do is to unlock my device. My iPhone 4 is running on iOS 4.3.5 firmware. What jailbreak tool should I use and where to download the software? Is Ultrasn0w working on iOS 4.3.5? Thanks.

Asked by: Jenny from Cary, North Carolina

Hello Jenny, welcome aboard! There are three things you need to know about jailbreaking and unlocking your iPhone 4 on iOS 4.3.5:
  1. All iPhones running on stock iOS 4.3.x firmware cannot be software unlocked (Ultrasn0w) due to the fact that its baseband is already updated.
  2. There’s no Utrasn0w unlock support for iOS 4.3.5 at the moment.
  3. You should consider using a hardware-unlock to free your device from its carrier.

Anyway, since your device is already running on stock iOS 4.3.5, you can use Redsn0w 0.9.8b4 to jailbreak iOS 4.3.5 firmware on your device. You can refer on this tutorial on how to jailbreak iOS 4.3.5 using Redsn0w 0.9.8b4.

Regarding hardware-based unlock, you will be glad to know that you will be able to unlock your iPhone 4 on iOS 4.3.5 using Gevey SIM Pro – a special SIM case that has capacity to unlock iPhone 4 running on any firmware and baseband versions. The step by step guide on how to unlock iPhone 4 using Gevey SIM Pro can be found here.

Unlock iPhone 4 using Gevey Sim

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