Let’s start:
1. Connect your iPhone 4 to a wi-fi network. No 3G please.
2. Open the Safari browser on your iPhone 4.
3. Go to Jailbreakme.com and jailbreak your iPhone 4. Make sure you have the iPhone firmware 3.1.3 to 4.0. No less than 3.1.3, no 4.x.
4.  Now go to Settings>General>Network and turn off 3G.

5. Now that you have jailbroken, you have ‘cydia’ installed on your iPhone 4. Press the home button and find ‘cydia’ in your apps in the springboard.
6. In cydia go to search and type ‘ultrasn0w‘. If you are presented with version 1.0.1 or higher skip to step 10 below. If the ultrasn0w version is less than 1.0.1, follow all the steps below.
7. You can’t unlock your iPhone 4 with an ultrasn0w version less than 1.0.1. You’d then need to bring over 1.0.1. For that purpose, press the ‘Manage‘ button at the bottom, selectSources>Edit>add. Then type ‘repo666.ultrasn0w.com’ in the text field without qouts.
8. Reboot your iPhone 4.
9. Go to cydia again, search for ultrasn0w. It must be on version 1.0.1 or higher now.
10. Now press the install button to install ultrasn0w.
11. Your iPhone 4 is now unlocked! Cheers!

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