how do I restart my iPhone?

Welcome to Apple Support Communities.

See: Force restart iPhone - Apple Support.

Jack

Ibrahim_Hasware wrote:

Option 1: Press and hold the volume down button and the side button until the power off slider appears.

Option 2: Setting --> General --> Shut Down

OP Said:

How do I hard restart my iPhone when it isn't responding?

The force restart methods must be used.

Jack

Option 1: Press and hold the volume down button and the side button until the power off slider appears.

Option 2: Setting --> General --> Shut Down