Quick Answer: To restart your iPhone without the power button, go to Settings > General > Shut Down, then slide to power off. You can also ask Siri to restart your iPhone without the 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. Slide to ...

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.