WARNING: iPHONE 4 USERS: IF YOU NEED AN UNLOCK – DO NOT UPDATE DIRECTLY TO iOS 4.1. THAT NEW BASEBAND CANNOT BE UNLOCKED (currently). If you have never been on iOS 4.1, and you need an unlock as well, DO THIS FIRST!

The process of jailbreaking an iPhone 3G/3GS and/or iPhone 4 is super simple. It involves using one of two programs: Limera1n or Greenpois0n. This guide will walk you through both tools. Either one will work great for both devices, so it’s your choice as to which one to use. So are you ready?

Alright, here we go. Let’s start with Limera1n first. If you would prefer to use Greenpois0n, you can look to the next section. Each one works equally as well, the steps are just slightly different.

LIMERA1N

1) You’ll need to have Limera1n on your Mac or PC. you can download that HERE

2) Launch Limera1n and connect your iPhone to your computer via USB. In the Limera1n app, click “Make it ra1n”

3) Your device will boot in to Recovery Mode automatically. Limera1n will then ask you to perform a few simple steps. Since Limera1n requires your device to be in DFU mode in order to work, it will walk you through the steps to getting there. Follow it’s instructions:

Hold home and power button down. When it prompts you to do so, release the POWER button, but continue holding down the HOME button. It will let you know what you can release it.

This process takes a few seconds, so be patient. IF YOU SEE THE LIMERA1N DROP ON YOUR SCREEN, YOU ARE DOING IT CORRECTLY.

After this process finishes, you’ll be jailbroken!

Next: From your home screen, look for the Limera1n icon and open it (it might be a white square. It is still fully functional, even if the icon doesn’t show up right away). You should then use that to install CYDIA.

After you have Cydia installed, you no longer need the Limera1n app. You can delete Limera1n off of your iPhone if you want. You will never need it again.

GREENPOIS0N

1) You’ll need to have Greenpois0n on your Mac or PC. you can download that HERE

2) Launch Greenpois0n, then power off your iPhone and connect it to your computer via USB. If you are using Windows 7, be sure to run it as administrator.

3)  Follow Greenpois0n’s instructions on screen. Since Greenpois0n requires your device to be in DFU mode in order to work, it will walk you through the steps to getting there. Follow it’s instructions:

Press and hold the sleep button (2 sec. timer). Continue holding sleep, and press and hold the home button (10 second timer). Release sleep button, and continue holding home (15 sec).

4) Once you’re in DFU mode, click the “Jailbreak!” button to jailbreak your iPhone.

5) Now, just wait until the status bar fills up, and then your iPhone will return to the home screen.

After this process finishes, you’ll be jailbroken!

Next: From your home screen, look for the Loader icon and open it. You should then use that to install CYDIA.

After you have Cydia installed, it will ask you if you want to remove the Loader app. Hit remove, and it will delete it from your iPhone and automatically reboot.

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