SemiTethered Jailbreak is Available for iOS 5
With the release of iOS 5 and you can tethered jailbreak on iOS 5 using Redsn0w. Till now, no untethered Jailbreak is present so you must connect your iDevice with your PC to reboot. To avoid rebooting using PC, a solution is there called SemiTethered. Semitethered is not a fully tethered jailbreak as u need to reboot your device but not with using your PC. You can find Semitethered under BigBoss repo and is compatible with iPhone, iPad and iPodTouch.
Follow below steps to use SemiTethered to Jailbreak your iDevice:
Step 1: Now open Cydia, navigate to Mange -> Sources, tap Edit box and enter http://thebigboss.org/semitether
Step 2: now search for SemiTether and install it on your iDeivce then reboot your iDeivce and here you have done it and you shall be able to reboot without getting stuck on Apple logo.
Note: SemiTethered Jailbreak is beta and you may face some problems.
Following are the updated release notes:
I updated to 0.7.9. This version will take about 90 seconds after it first boots up and then your device will respring again. This timing was the only way to get some of the launch daemons to properly relaunch.
SemiTether 0.7.9 should fix issues for some of you where:
1) Device does not sync with itunes and only errors. Hopefully solved.
2) Device reboots after 2-3 minutes.
For batter understanding watch below video to see the whole process of SemiTethered Jailbreak on iPhone 4 GSM: