Turning the iPhone off is a pain. You have to hold down the button and wait for a while, then select the Power Off button. Turning it back on takes a while to

Turning the iPhone off is a pain. You have to hold down the button and wait for a while, then select the Power Off button. Turning it back on takes a while too. It's certainly possible that most people don't even know how to do this. Airplane mode is the obvious choice as it's faster to both enable and disable.