Learn how to perform a soft and factory reset of the device.
INSTRUCTIONS & INFO
A master reset reverts the device back to factory settings. It will permanently erase all personal data, preferences, settings and content such as pictures, ringtones and apps that are saved to the device. Data stored to an SD card will not be erased unless otherwise selected. It is recommended that you save (backup) important data to your SIM, SD card, or a computer before proceeding.
From the home screen, tap Apps.
Swipe to, then tap Settings.
From the "Accounts" tab, tap Backup and reset.
Tap Factory data reset.
Tap Reset device.
Tap Delete all.
If unable to reset the device using the above steps, try the alternate master reset method by first powering the device off. When powered off, press and hold the Volume Up, Home and the Power/Lock key.
Press the Volume down key, to highlight wipe data/factory reset.
Press the Power key.
Press the Volume down key until Yes - delete all user data is highlighted, and then press the Power key.