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How to unlock iphone 4S

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Earlier, Gizmodo shared an usual method to unlock an iPhone. The method does not require you to jailbreak the iPhone. What you need is an original SIM card from AT&T and follow a set of procedures to unlock it.
As reported by Gizmodo, some users found the method works on their iPhone but some are not. I do not have the AT&T SIM card to test. I’m not sure whether this method works on all models of iPhone. So try at your own risk.

It Works Temporarily

But one thing @musclenerd from iPhone Dev team confirmed is that this unlock method is not a permanent unlock method. You’ll lose the unlock some time in the future.
@markgurman If you are successful at temporarily gaining network access, you’ll lose it as soon as TMSI is refreshed (happens often)
If you’re adventurous and understand the risk, here is the tutorialprovided by Gizmodo to unlock an iPhone 4S.
1. Insert 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 AT&T SIM card
5. Insert T-Mobile SIM card
6. Make sure WiFi is off ( also tap on ‘Forget this Network” to make sure it doesn’t connect automatically later)
7. Switch off Airplane Mode and iPhone will search for network. This is followed by the Apple splash screen appearing.
8. Activation Required will be displayed on the screen
9. EDGE network will activate automatically – 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 iPhone and the same Activation Required screen will be displayed
12. When you see one signal bar, tap on Use Cellular Connection
13. Eject SIM card
14. Activation Required screen will be displayed the second time
15. Insert SIM card
16. Unlocked!
Let us know if this method works for you.

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