From the main screen, press the MENU key.
Swipe your finger up the screen to reveal more options.
Tap "Factory data reset."
You will receive a message detailing everything that will be erased. Note: You may also erase data on the phone's SD card by tapping the "Format SD card" checkbox. If you want to proceed, tap "Reset phone." Your phone will begin the reset process, then shut off and power back on automatically. Read the message then tap "Erase everything" to proceed.
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