Unlock Phone SIM will unlock your iPhone 4S officially by IMEI. Our iPhone unlock service works by whitelisting your phone in the carriers IMEI Database, which means your iPhone 4S is unlocked permanently.
Is there any way to unlock an iPhone 4?
If you have an iPhone 4 it is pretty easy to unlock for free. It involves a process known as jailbreaking (opening up the software on your phone) and then running some additional software to perform the actual unlock. ... To check your iOS version and baseband, go to Settings > General > About on your iPhone.