p0sixspwn is a tool for Windows and Mac that provides untethered jailbreaks for:

• iPhone 5: iOS 6.1.3 and 6.1.4
• iPhone 4S: iOS 6.1.3
• iPhone 4: iOS 6.1.3
• iPhone 3GS: iOS 6.1.3 and 6.1.6
• iPad 4th generation: iOS 6.1.3
• iPad 3rd generation: iOS 6.1.3
• iPad 2: iOS 6.1.3
• iPad mini: iOS 6.1.3
• iPod touch 5th generation: iOS 6.1.3
• iPod touch 4th generation: iOS 6.1.3, 6.1.5, and 6.1.6

p0sixspwn runs on already-upgraded
un-jailbroken devices.

Steps: Download p0sixspwn. Open it, plug your device into your computer, and follow the instructions.

Note for unlockers: if you upgrade iOS using iTunes, it will upgrade your iPhone's baseband, which negatively affects unofficial unlocks that depend on specific baseband versions.