It’s been quite a long time to iPhone 4S launch but we haven’t seen any unlock from iPhone Dev Team in the form of Ultrasn0w unlock or some hardware type Gevey sims for iPhone 4S unlock. Thanks to some glitches in new iOS 5 update which will let you unlock iPhone 4S on any carrier sim without any Gevey sim or Ultrasn0w unlock (no need for JAILBREAK).
Folks over at Macrumors forums have found a way to unlock iPhone 4S (only AT&T network iPhone) can be unlocked if you follow a certain steps which are described below:
Insert original carrier AT&T SIM card
Dial 611 for AT&T customer service hotline and drop the call
Turn on Airplane Mode
Take out AT&T SIM card
Insert T-Mobile SIM card
Make sure WiFi is off ( also tap on ‘Forget this Network” to make sure it doesn’t connect automatically later)
Switch off Airplane Mode and iPhone will search for network. This is followed by the Apple splash screen appearing.
Activation Required will be displayed on the screen
EDGE network will activate automatically – notice the ‘E’ on the top left corner of the screen
Wait for about 20-30 seconds and turn off the phone
Turn on iPhone and the same Activation Required screen will be displayed
When you see one signal bar, tap on Use Cellular Connection
Eject SIM card
Activation Required screen will be displayed the second time
Insert SIM card
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 check the Video below on how you can do it:
Update: the unlock also works with the iPhone 3GS and iPhone 4, and the process will done again if you reset your device.