Wish you hadn't jail-broken your iPhone
there a JailBreak for the iPhone 4s and below But Not iPhone 4S running 5.1 the Key is iPhone 4S running 5.1 has not been jail broken yet.
it will go back to factory settings....
Yes you can, but expect some iOS functionalities that are on, say the iPhone 5S won't carry over to the iPhone 4.
Yes you can unjailbreak your iPhone by connecting it to iTunes and doing a restore. That will set it back to like it was when it came from the factory.
Adding Themes is only available to Jail broken, iPod Touch, and iPhone users.
Yes. Just sync your iPhone with your computer and download the 2.2 software. The new software should wipe out the jailbreak, so just re-install it.
Not if you ue greenpois0n. I have and it works a treat
To fix an iPhone 4 with no sound, simply reset the phone, reboot, or jail break it if all fails, because the problem is software-based.
Jail-breaking an iPhone is illegal, but jail-breaking an iPod Touch is not.
NO you MUST have a Laptop Or a Computer
under settings switch to auto instead of T-Mobile. It worked for me, and I'm running 2.1 firmware, unlocked and jail-broken!