Shortly after Apple launched iPhone 4S from some time, users began asking about unlock for iPhone 4S, and since that users do not take any word from the Dev Team blog about Ultrasn0w about if it is going to unlock iPhone 4S to work on any carrier or not, so that we have got some good news that all users want it just after the jump:

Thankfully some guys at MacRumors forum have got a way that will unlock your iPhone 4S without needing to use Gevey SIM or Ultrasn0w tool and also no jailbreak required, you can follow this steps and after it you will unlock your iPhone:

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!
FAQ
1. ”is this a permanent unlock? if I update my iPhone 4S firmware will the unlock go away? And has this been tested and confirmed”
A: “ It has been confirmed but It is not sure if a software update will patch it. Hope that helps”

You can watch this video guide that will help you to jailbreak iPhone 4S...

We will keep you updated if there is something new update to these steps...
UPDATE: The method has been reported to be working on iPhone 4 and iPhone 3GS too. It should work on iOS 5 only, iOS 5.0.1 is not supported.

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