Note: This guide is for iPhone 4
running iOS 3.1.3 to 4.0. If you
are
running iOS version later than
4.0.
This guide is not recommended
for
you.
The credit for this unlock
solution for
iPhone 4 goes to iPhone Dev
Team.
Without engaging you in more
details,
I ’d guide you through 10 steps
to
unlock your iPhone 4. It
shouldn ’t take
you more than 5 minutes.
Let ’s start:
Step 1. Connect your iPhone 4
to a wi-fi
network. No 3G please.
Step 2. Open the Safari browser
on your
iPhone 4.
Step 3. Go to Jailbreakme.com
and
jailbreak your iPhone 4. Make
sure

Lost all the information from your iphone?? Dont be panic.You can still retrieve all the information by following the below steps if your iphone is already jailbroken

Step 1.Find out the Iphone Back up directory

The backup directory for Windows 7 and Vista is

C:\Users\USERNAME\AppData\Roaming\AppleComputer\MobileSync\Backup

The backup directory for Windows XP is

C:\Documents and Settings\user\Application Data\Apple Computer\MobileSync\Backup

Step 2:Download iPhone Backup Extractor

http://www.iphonebackupextractor.com/free-download/