1st method
- Go to Menu -> Settings -> Privacy -> Tap Factory Data Reset
- Tap Reset Phone
- Tap Erase Everything
2nd method
- Power off the phone
- Press and hold Volume up (Red) + Call (Blue) + Power On (Yellow)
- Use touchpad (Green) to navigate to Wipe data and select it by clicking the touchpad (Green)
- With touchpad (Green) navigate to Yes and select it by clicking the touchpad (Green)
- Navigate to Reboot phone now
