Use the Factory Data Reset option in your Android settings to reset your phone. After resetting the phone, you have to re-enter your credentials on the start-up screen.Continue Reading
Hold down the power button to turn on your phone. Wait a few moments for the Android operating system to boot.
Swipe down from the top of your phone, and tap the grid icon in the upper-right corner. Tap the Settings button on the next screen to access more menu options. Depending on the age of your phone, tapping the Menu button on the home screen reveals the Settings menu.
Tap Privacy in the Settings menu to access the Factory Reset option. You can also find the Factory & Reset option under the Personal section, depending on your Android version.
Tap the Factory Reset area to bring up new options. Tap Factory data reset. Verify the information on the next screen, and tap Reset phone. Wait as the system resets Android and reboots the phone.
Follow the on-screen instructions to sign in to your Google account. Afterward, download your apps, sync your services and update your phone.