iPhone 4S can be unlocked without the hardware and software intervention

This unlocking allegedly allows AT & T version of the iPhone 4S in the networks of T-Mobile, and for its implementation will require a properly trimmed in size SIM card of the operator as well as a number of simple steps, including: insert the original SIM card AT & T

• Dial number 611 support subscriber AT & T and reset the call
• Insert mode on the plane
• Remove the SIM card from AT & T and insert it into an analogue of T-Mobile
• Make sure that the Wi-Fi is disabled (in network settings, you can click on the item "Forget this network" so that your smartphone is not connected to it automatically)
• Disable operation in the plane, then iPhone will look for the network.
• You will see a notification "is required to activate"
• Then automatically activates EDGE - in the upper left corner of the screen the letter E
• Wait about 20-30 seconds and turn off the smartphone
• Turn the iPhone, then re-appear on the screen warning "Requires activation"
• After the appearance of one bar of signal level, click on the item 'Use the connection to the network "
• Take out the SIM card, and then again get the message "Requires activation"
• Finally, insert the SIM card from T-Mobile's back and use at your pleasure unlocked device. 

We add that this method is also applicable to iPhone 3GS and iPhone 4 , but after a reboot the mobile device you will need to again go through this procedure. Apparently, the trick should work not only at T-Mobile, but it has not yet been confirmed by practical trials. Finally, we note that in this paper, we do not consider the ethical and legal aspects of the procedure unlock, and all experiments in this regard should solely at your own risk of and conscience.