How to Check Your iPhone Unlock Status
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.
You will be presented with a long list of information about your iPhone, including the model, release date, hardware information and operating frequencies. Now you can scroll down to the "Free simlock status check" button. Click this button to compare your iPhone to a list of factory unlocked iPhones in the database. You will also be presented with current warranty information for your device.
The website is useful to quickly get a variety of information about your iPhone or a device you're looking to buy. Getting the IMEI of a device you are interested in will verify the information presented by the seller, and let you know if the iPhone can be used on multiple carriers.