How To Unlock iPhone?
Actually there is no need to Enter an "Unlock Code" on Apple iPhone, all the process is done via iTunes once you receive from us the confirmation of Unlock. The most important part is in case you "Jailbreak" your iPhone in past to unlock it, that you remove all application related to that. Once your iPhone is clean from any Jailbreak Application please follow these steps :
1 - Install the last version of iTunes
2 - Make sure your iPhone is updated with the lastest version of Firmware (Currently iOS 9.2)
3 - Swiftch on your iPhone with an Not Accepted SIM Card
4 - Connect your iPhone to your computer using the Original USB Cable
5 - Launch iTunes & wait until iTunes detect your iPhone
6 - Now disconnect your iPhone and reconnect it after 10 seconds.
7 - Your iPhone is now Unlocked.
PS: in Case your iPhone is not unlocked, just do "Restore" !