NOTE: THIS WORKS BEST ON SAMSUNG WINDOWS 7 PHONES
Step 1: On your device, open Internet Explorer and tap WindowBreak by WindowsPhoneHacker in as your URL.
Step 2: Select WindowBreak Me.
Step 3: Head over to the Dialer, and arouse the diagnostics menu by typing in ##634#.
Step 4: Open up the GPRS Manager by typing *#9908#.
Step 5: You will see that WindowBreak has been copied into that folder. Tap on it and Save.
Step 6: Your device has successfully been jailbroken and your device unlocked! Reboot, and you’ll be good to go!