Force your phone to restart if it freezes
Since Apple has been getting rid of most buttons on phones, it can be hard to know how to access certain features that used to be activated by pressing something. One of these features is the forced reset to turn the phone off when it freezes. It is a fact that once in a while iPhones crash and the only fix is to force a shutdown.
It used to be done by holding down the power and the home buttons at the same time. However, the home button was removed four models ago. In the newer ones, you can trigger the same command by pressing volume up, then volume down, and then holding the power one down.