This is the new Untether Jailbreak for iOS 6.0 to 6.1.2 an all iDevices, witch means for A4, A5 and A6 devices. Download the needed file for either Linux, Mac or Windows below and extract the Evasi0n program and run it and the just plug your iOS 6 device in and click Jailbreak. Then it will ask you to unlock your device and click the Evasi0n icon, do that ad let it finish.
DO NOT UNPLUG YOUR DEVICE UNTILL FINISHED!!