A tape measure, a metal detector and a spirit level: 25 surprisingly useful things you can do with your phone

While many use our phones predominantly to doomscroll, smartphones have a range of little-known functions that could make life better and easier - from heart monitoring to even developing camera film

Our smartphones are magical things - far more than dopamine drip providers and a way to keep in touch with friends and family. Using the built-in features and easily available additional apps, there are plenty of clever things you can do with your smartphone.