Need to find out if an iPhone is officially unlocked for use on multiple cellular carriers? Now you can find the answer to this question and more using a simple website. All you need is the unique IMEI number assigned to your device.
To get your IMEI number navigate to Settings -> General -> About and scroll down to IMEI. The IMEI is a unique 15-digit number. Now go to the website IMEI.info, enter this number and click the CHECK button.