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How to Unlock iPhone 4 From O2 UK?

Hi, I have a jailbroken iPhone 4 that I got from UK when I visited some friends and relatives. The iPhone 4 is running on untethered iOS 4.1 jailbreak and with baseband 02.10.04 and it was unlocked by the O2 carrier staff a month before I left. But at the moment, I’m in Hong Kong and I can’t use the phone. It’s useless, can’t send / receives SMS and phone calls. I already tried putting a different SIM and it still doesn’t work. It’s very frustrating. Can I use Ultrasn0w to unlock iPhone 4 from O2? Please help.

Asked by: Josephine from Pittsburgh, Pennsylvania

Hello Josephine, unfortunately, you won’t be able to unlock your fourth gen-iPhone using Ultrasn0w carrier unlocking tool as your mobile phone is running on a new 02.10.04 baseband, which is not supported by the software. Other iPhone 4 and iPhone 3GS’s baseband that is not supported by Ultrasn0w 1.2.3 are: 05.14.02 / 05.15.04 / 05.16.01 / 05.16.02 / 02.10.04 / 03.10.01 / 04.10.01. And the Ultrasn0w supported baseband includes 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 01.59.00 / 06.15.00 (iPad baseband).

Alternatively, you can easily unlock your iPhone using a hardware unlock tool called Gevey SIM. Since your iPhone 4 is already jailbroken, you can now activate your iPhone 4 in order to make other features of the iOS working smoothly on a new unlock iPhone. You can follow this guide on how to activate iPhone 4 using SAM. Once activated, you can now unlock it with your Gevey SIM. If you aren’t familiar with the unlocking process using Gevey SIM, then you can also refer on this tutorial on how to unlock iPhone 4 on iOS 4.3.3 using Gevey SIM
Unlock iPhone from O2

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