No.
If you are running 3.1.3 (the latest firmware) on any iPhone, then you can jailbreak without unlocking.
If you are on a firmware below 3.0, I think you can jailbreak without unlocking.
I would like to add that I am pretty sure jailbreaking an iPhone is illegal because of your contract with Apple.
Find me on YouTube:
TheJailbreakGenius
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).'
No, you can even unlock the iPhone when Jailbroken.
To unlock iPhone 3gs on iOS 4.1 you have jailbreak your device first.
PwnageTool 4.2
Yes, but first you must unlock and jailbreak your iphone.
redsnow which you will need to jailbreak its the easiest way to do it and its free
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.
You need to use the program RedSnOw to jailbreak an iPhone 5.
You need to use the program RedSnOw to jailbreak an iPhone 5.
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.
yes use limerain
Yes