Before you can unlock your iPhone, you must jailbreak your iPhone first. If your iPhone model is Factory Unlocked (FU) iPhone, this tutorial is not necessary for you.

If you coming from from previous tutorial: How to Jailbreak iPhone 3.1 Firmware (Windows), you can continue reading this tutorial because your iPhone is jailbroken. If your iPhone have not jailbroken, it’s recommended to read previous tutorial How to Jailbreak iPhone 3.1 Firmware (Windows).

The baseband version of iPhone 3.1.2 firmware is 05.11.07. Previously, the 05.11.07 baseband is not available to unlock. Now, you can unlock 05.11.07 baseband using sn0w package inside blackra1n app. Check your baseband version and make sure the baseband version is 05.11.07 before you continue reading this guide.

1. Connect your iPhone to Wi-Fi network and make sure that the Wi-Fi network has Internet access.
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