Restarting your iPhone is usually straightforward, but it gets a bit trickier if you don't have a working power button.

To turn on an Android phone without Power button, put the phone in fastbooot mode using Volume Up+Volume Down and connect the phone to a computer. Download and install the universal ADB drivers on ...

An unsung addition to the new Control Center is a power button in the top-right corner. Press that button, and the standard power slider will appear on screen so you can turn off your iPhone.

To restart your iPhone without the power button, you can shut down via settings, ask Siri for help, or let your battery die. Then, recharge or turn back on.