The most common way to turn off a phone screen and lock the device is to use the on-off button. That usually sits on the side of the phone and needs to be squeezed quite tightly. You need to do the same to turn the screen back on. However, there’s a quicker and more elegant way to do it – a simple double tap on the display, assuming the manufacturer supports this feature. Some like Samsung do but others only go halfway. Google’s Pixel phones, for example, can be brought to life with a double tap but can’t be put back to sleep the same way. This is where an app like Screen Off Widget comes in h…