25 Useful things on your phone 25 Useful things on your phone Turn your phone into a tape measure I do not have an Apple phone so I use a cheap digital tape measure bought from Adli for less than £10. The iPhone’s Measure app uses augmented reality and the device’s camera to calculate everything from ceiling heights to room dimensions – handy for those DIY tasks that require a quick decision. And, good news for parents, Apple also points out that you can use it to measure