If I can make a suggestion, do not use BlackRa1n. It is buggy and unstable. PwnageTool is much more stable and “clean”.
This article is a summary of the options you have to jailbreak your iPhone 3.1.2 depending on your model.
There are many reasons to jailbreak your iPhone 3.1.2 (I have 30 of them here) such as being able to install applications not allowed in the App Store, or most importantly, to unlock your iPhone so it works with other carriers.
Jailbreak iPhone 2G 3.1.2:
- Jailbreak iPhone 2G 3.1.2 with BlackRa1n RC3
- Use BlackRa1n to jailbreak your iPhone 2G 3.1.2 on Windows or Mac
- Jailbreak iPhone 2G 3.1.2 with BlackRa1n RC2
- Use PwnageTool to jailbreak your iPhone 2G 3.1.2 on Mac
Jailbreak iPhone 3G 3.1.2:
- Jailbreak iPhone 3G 3.1.2 with BlackRa1n RC3
- Use BlackRa1n to jailbreak your iPhone 3G 3.1.2 on Windows or Mac
- Jailbreak iPhone 3G 3.1.2 with BlackRa1n RC2
- Use PwnageTool to jailbreak your iPhone 3G 3.1.2 on Mac
Jailbreak iPhone 3GS 3.1.2: