The proper way to do it is as follows..
1. Turn phone off.
2. Hold the VOLUME DOWN and POWER buttons simultaneously, you'll feel a vibration almost immediately, keep holding the two buttons for about ten to fifteen seconds until you feel another vibration.
3. Release the buttons and immediately press the VOLUME DOWN button until you see a large exclamation point (!) In the center of the screen and nothing else.
4. Release the button and quickly press the following buttons in this order (do not hold just press and release)..
VOLUME UP
VOLUME DOWN
POWER
VOLUME DOWN
5. The phone should now reboot itself and when the screen comes on you will see gears. The phone is resetting to factory specs. Be patient, it could take up to a half hour.
VÒILÁ! she is back to factory settings, after gears with progression bar ends, phone should reboot and you are brand spanking new. Good luck! Happy Resetting!!