A factory data reset may help with a blank or frozen screen, apps crashing or freezing, keypad/touchscreen problems, can't hear, device making noises, can't make or receive calls, and device won't sync.
Perform a factory data reset only if absolutely necessary as it removes all data including:
Wi-Fi Calling settings don't transfer after switching devices and/or performing a factory data reset. You need to enable W-Fi Calling manually if you want to use it.
Related Topic: Factory Data Reset