First, save your contacts to your sim card, then remove it from the phone so you do not loose them. You will photos and ringtones you have bought. Unless you have saved them to a memory card.
Take out the battery then put it back in. At the same time, press the power button down to turn it on, press up on the D pad (spinning wheel). You will be asked if you want to reset the phone. Select yes and it will reset the phone back to out of the box condition.
Exterminate the living dead and keep our fellow citizens alive and safe. We will be connecting with our fellow businesses, the police department, funeral home, and weapon manufacturers to help map out, and exterminate the pesky living dead from our community.