Official unlocking of Apple-iPhone is now supported, means Apple iPhone 4 can be unlocked easily. It is fast and secure way to unlock the phone by IMEI. You can unlock all Apple iPhone 4 devices from any network. Once the restriction is removed, you can use all GSM simcards on your phone.
To unlock your phone, we need only 15-digits IMEI. You can find the 15-digit correct IMEI by dialing *#06# on the phone.
Unlocking of the Apple iPhone 4 by code does not avoid warranty. It is recommended method by manufacturer of Apple-iPhone to unlock the phone by code.
Unlocking of Apple phone does not involved any code. Unlocking of Apple iPhone is done through official server itself.