Jailbreak for iPhone 4S and iPad 2 application is called Absinthe iOS 5.0/5.01 A5 untethered jailbreak. Remember if you do, you eliminate the warranty of the Apple products you own.
The Absinthe program will perform some of the process and restart the device when the jailbreaking process has been completed.
Upon successful completion and will be featured Absinthe icon in the iPhone 4s / iPad 2, click the icon (it will restart again) then the program will be installed cydia.
When the phone or iPad can not reboot, go to Settings -> Network -> VPN and VPN set to ON. Error message will appear, wait a minute and the device will reboot.
Tips for those who want to jailbreak the iPhone 4S and iPad 2, make sure you use a laptop with good battery condition. This is so the jailbreak process is not interrupted because of power failure. Also make sure the firmware is at version 5.0 for the iPhone 4S and 5.0.1 for the iPad 2. To download the jailbreak tools, you can visit the Greenpoison official website at http://greenpois0n.com