As usual, before you consider jailbreaking your iPhone, remember to read the requirements carefully. If you have anything unclear, just leave your question in the comment. First and foremost, Spirit is NOT an unlock tool. If you are looking for unlock solution on 3.1.3, this is not for you. Spirit is just a tool that lets you jailbreak (untethered) your iPhone and with cydia installed. You may read this the information about Spirit here.

Before your proceed, you have to do the following here:
  • Make sure you are using iTunes 9.0 or up
  • You should be using either iPhone OS 3.1.2. or 3.1.3. For those using iPhone 3G/3GS and needs to stay unlocked, please remember NOT to upgrade to iPhone OS 3.1.3.
  • Your iPhone should be activated before using Spirit. That means, it should not be in the emergency screen or connect to iTunes screen
How to Jailbreak iPhone Using Spirit

Before you proceed to jailbreak process, remember to sync your iPhone with iTunes to backup all your data.

2. Download Spirit jailbreak tool from here (Windows / Mac ) and extract the zip file.

3. Launch the Spirit application

4. Once the Spirit tool is launched, plug into your iPhone via USB and the tool detects your current iPhone OS version. Simply click the “Jailbreak” button.

5. Your iPhone will be restarted and goes through the Spirit jailbreak process. Once completed, your iPhone is jailbroken with cydia installed. Enjoy!