You can cancel your jailbreak by restoring your iPod or updating to the latest firmware
yes,the 5.0.1 jailbreak came out !Official EasyRa1n Unlock/Jailbreak iPhone 4/4S iOS 5.0.1
Well, use Redsn0w to jailbreak/unlock the iPod.
PwnageTool 4.2
To unlock iPhone 3gs on iOS 4.1 you have jailbreak your device first.
It depends. If you UNLOCK it and put a new SIM in: No. If you just JAILBREAK it: Yes, yes you do.
Yes u just have to jailbreak it
No, you can even unlock the iPhone when Jailbroken.
Yes
yes use limerain
To jailbreak an iPhone 4 you need to download redsn0w. For better info go to youtube and search ' how to jailbreak iPhone 4 on (whatever your OS is .example: IOS 5).'
To unlock your iPhone with you Tmobile SIM card I would suggest you goto easyiphoneunlocker.com they have a very easy to use tool to unlock and jailbreak your iphone. I was able to unlock my iPhone 4S within in 10 minutes with no issues.
No it is not. It is for AT&T unless you "jailbreak" and "unlock" an iphone. Instructions to do this can be found on the internet.