How to unlock iPhone 4

You can now use a carrier unlock on iPhone 4, thanks to the latest ultrasn0w release from iPhone Dev Team. Installing the carrier unlock is easy, but you’ll need to jailbreak your iPhone before it works. Here are the requirements and steps to unlock the iPhone 4:

How to unlock iPhone 4

Unlocking the iPhone 4 from a carrier is pretty easy:

• Jailbreak the iPhone (I recommend the easy iPhone jailbreak for iOS 3.1.2, or download Pwnage Tool 4.1 for iOS 4.1)
• Run Cydia and tap on “Manage”
• Navigate to “Edit” and tap on “Add” and enter the following URL repository: “repo666.ultrasn0w.com”
• Now search Cydia for “ultrasn0w 1.0-1” and install the package
• Once the ultrasn0w package is installed, restart iPhone 4 to complete the carrier unlock

Your iPhone 4 is now unlocked and untied to any specific carrier, the device will work on any GSM carrier around the world with the proper sim card.

Remember that the iPhone 4 uses micro sim format, you can manually trim down existing sim cards to fit into the iPhone 4’s micro sim bay but it’s a delicate process and will certainly require a fair amount of patience as well as an exacto knife or razor blade.

What baseband does the iPhone 4 unlock work with?

The ultrasn0w unlock works with iPhone 4 baseband 01.59 and also on iPhone 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04.

What is iPhone baseband?

In case you are curious, iPhone baseband is basically the 3G cellular modem firmware. Hacking the baseband is what allows the unlocked iPhone to actually use the cellular portion of the phone to make and receive calls and data.

If you need to, you can download iPhone firmware IPSW files of nearly all versions released from 3.0.0 and up.

Is unlocking the iPhone illegal?

Using a carrier unlock and jailbreaking iPhone is not illegal thanks to a recent ruling by US officials, however using either hack will likely void your warranty with Apple. If you have a jailbroke and unlocked device, it’s best to unjailbreak it before you take it into Apple for any kind of warranty service or care.