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

Using the New Power Button in Control Center Swipe down from the top-right corner of your iPhone screen to open Control Center. Press and hold the Power button in the top-right corner.

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.