JailbreakMe is the easiest jailbreak tool to date. Jailbreaking your device can be done from anywhere, with no computer: just visit jailbreakme.com with the device's web browser.
JailbreakMe 3.0 runs on already-upgraded un-jailbroken
iPhones, iPod touches, and iPads:
- iPad 1: 4.3 through 4.3.3
- iPad 2: 4.3.3
- iPhone 3GS: 4.3 through 4.3.3
- iPhone 4 (GSM): 4.3 through 4.3.3
- iPhone 4 (CDMA): 4.2.6 through 4.2.8
- iPod touch 3rd generation: 4.3, 4.3.2, 4.3.3
- iPod touch 4th generation: 4.3 through 4.3.3
For devices on old firmwares (3.1.2 through 4.0.1): visit jailbreakme.com/star
Note for unlockers: if you upgrade iOS using iTunes, it will upgrade your iPhone's baseband, which negatively affects iPhones unofficially unlocked with ultrasn0w. Instead use redsn0w's "Custom IPSW" feature to upgrade and jailbreak your device while preserving your baseband.