It’s pretty easy to know if your device can be jailbroken if you’re already used to jailbreaking your device. But for people who are new to jailbreaking, knowing if the iPhone, iPad or iPod touch can be jailbroken might not be that easy — and is the first thing it should be known. Luckily, Lifehacker has put up this chart together, originally from BigBoss, that determines whether your iDevice’s current iOS version can be jailbroken and what type of jailbreak it has: Untethered or tethered jailbreak.
No jailbreak, red colored. Untethered jailbreak, green colored, means that the device can be jailbreak without having to connect your device to a computer every time you reboot the device. Tethered jailbreak in yellow means that there’s a jailbreak for your device, but your will have to connect the device to a computer every time your turn in off and then back on.
From iOS 3.0.0 to 5.0.1, iPhone 4S, iPhone 4, iPhone 3GS iPad 1, iPad 2, iPod touch 3G/4G, iPod touch 2G. iPhone 3GS has the most jailbreak. iPhone 4S and iPad 2 (A5 chip) owners will have to keep waiting. Currently the only A5-based device that can be jailbroken is the iPad 2 running iOS 4.3.3, which can be jailbreak using JailbreakMe 3.0.