A developer by the name of Caleb Daniels seems to have discovered a method that will unlock the AT&T version of the iPhone 4S without any software or hardware tweaking. As of right now, the method is reported to work only with the AT&T version with a CDMA iPhone 4S method in the works (according to Daniels).
The unlock will assist you in using your iPhone 4S on T-Mobile’s network as long as you have a T-Mobile SIM card (something you’ll need anyway). Some twitter users have confirmed that this method does work so if you’re interested in giving it a shot, feel free to follow the steps below:
Quick Note #1: Your T-Mobile SIM card needs to be the size of a microSIM
You will need to make sure your T-Mobile SIM card is equivalent to the size of your microSIM from AT&T. You can do this by cutting your T-Mobile SIM card yourself with something like an exacto-knife, purchasing a SIM card cutter, or obtaining a microSIM through T-Mobile’s website.
Quick Note #2: You need a T-Mobile data plan in order for this to work
One of the steps requires you to have access to Edge, this will only work if you have a data plan.
Unlock the iPhone 4S (AT&T version) Without Hardware or Software Tweaking
- Insert the original AT&T SIM card.
- Dial 611 and drop the call.
- Turn on Airplane Mode.
- Take the AT&T SIM card out.
- Insert the T-Mobile SIM card.
- Make sure Wi-Fi is turned off (to ensure it doesn’t connect automatically later, just hit “Forget this Network")
- Turn Airplane Mode off. The iPhone will search for the network and then Apple’s splash screen will appear. The Activation Required will then be displayed on the screen and the Edge network will activate automatically (check for an “E” in the top left corner of the screen)
- Wait 20-30 seconds at this point then turn the iPhone off.
- Turn the iPhone back on and the same Activation Required screen will then be displayed.
- Continue to wait and when you see one signal bar, hit “Use Cellular Connection”
- Eject the SIM card and the Activation Required screen will appear for the second time.
- Put the SIM card back in and voila! You will be unlocked!
The method is definitely something different in terms of how the community has been unlocking their iPhones in the past but it has been confirmed to work. If you end up trying it out, share your experience below! Furthermore, feel free to discuss any issues or whether or not the method worked or you!
Source: Caleb Daniels, @chronic