One of the most difficult and often impossible tasks is the career unlocking of the iPhone. However it was quite a simple process back in the early iPhone era via Ultrasn0w, but nowadays customers have to either request the carrier to unlock the device or apply to ethically-dubious GEVEY interposer, requiring a spoof-dial to the emergency services. However Gizmodo claims to have found a way of unlocking iPhone 4S, iPhone 4 and iPhone 3GS that requires no use of any hardware or software.
However there is a disclaimer saying that some people have confirmed the method to be functional, while some have reported the difficulties. So as there are mixed results, it is up to you to decide to take a risk or not. And one more thing – it is confirmed to only work for AT&T devices so far.
Below we’ve clarified the process of unlocking step by step, so follow the guidelines carefully to avoid disappointing results.
First of all you should get and insert AT&T SIM into your iPhone 4S/4/3GS. Once inserted, make a call to 611- that is customer service number of the career. When you’ve dropped the call, activate airplane mode on your iPhone.
Now remove the AT&T SIM and replace with the T-Mobile one. You should ensure that there are no Wi-Fi connections running. To do this, tap on ‘Forget this Network" to make sure it doesn't connect automatically later.
You should now deactivate the Airplane mode and wait for your device to search for a signal. This will be followed by the appearing of an Apple splash screen. The device will now require the activation and the EDGE network will activate automatically – E sign will appear at the left corner of the display.
Now take a deep breath and hold on for about 30 seconds before you turn off the phone. When you turn your iPhone back on, the Activation Required screen will again be displayed. Tap on Use Cellular Connection when you see the signal bar and eject SIM card. Again the Activation Required screen will be displayed- now insert the SIM card and you’re UNLOCKED!
There has been a video of the unlocking process described above in action, but the author has made it private for unidentified reasons. So consider that you proceed on your own, at your own risk. Wish you luck!