Unlock iPhone 3GS, iPhone 4 and 4S without jailbreak

Michael Capozzi found an interesting bug in iOS 5, allow anyone to unlock iPhone 3GS, iPhone 4 and iPhone 4S. Unlock method presented last night seems to work for some iPhone owners who bought with AT & T in the U.S. Unlock method is based on an iOS 5 bug and the video below shows the entire procedure.

Following are the instructions for iOS 5.

1.   Insert the original carrier AT & T SIM card

2.   Dial 611 for AT & T customer service hotline and drop the call

3.   Turn on Airplane Mode

4.   Take out the SIM card AT & T

5.   Insert T-Mobile SIM card

6.   Make sure WiFi is off (also on tap "Forget this Network" to make sure it Does not connect  

      automatically side)

7.   Switch off Airplane Mode and iPhone Will search for network. This is the Apple splash screen 

      FOLLOWED BY appearing.

8.   Activation Required will be displayed on the screen

9.   Will EDGE network automatically activated – notice the ‘E’ on the top left corner of the screen

10. Wait for about 20-30 seconds and turn off the phone

11. Turn on the iPhone and the Same Activation Required screen will be displayed

12. When you see one signal bar, tap on Doors Cellular Connection

13. Eject the SIM card

14. Activation Required screen displayed will be the second time

15. Insert SIM card

16. Unlocked!.

Unlocking your iPhone would allow you to use it in T-Mobile's network as well as in other countries' networks.