We look at the newly announced iPhones to see what has changed and if any new features might be worth your upgrade dollars.

Method 1: Know the model of a Samsung mobile phone by checking the back Flipping any Samsung phone will show that there’s at least 2 tiny lines of information at the bottom.

You'll then see general information about your phone, such as its model name, model number and serial number. Just knowing your phone's model name is enough to get a rough estimate of how old it is.