A lot of people have been asking us if our previous unlock method would work on newer firmware versions, and the answer is yes. Factory unlocked phones will remain unlocked permanently. If you don’t already have your phone factory unlocked the process is really easy, the only downside is that it will cost you money. AT&T unlocks are the most common and only cost $20. All you have to do is find your imei number by opening the settings application tapping on general, about, and scrolling down.