How to Restart an Android Phone Without the Power Button Android devices have a few different methods for restarting a phone without a functional physical power button.

Fifth solution: Factory reset/master reset. A master reset or factory reset can be deemed among the last resorts if your Nokia 8 still lags and freezes after exhausting all prior methods.

Select Factory data reset. Tap Reset Device. Tap Erase Everything. Wait until the reset is finished and your phone to restart. Then follow the onscreen instructions to set up your phone as new.