The following steps are intended for the LG Rumor Reflex.
Tap the Home icon.
Tap Main Menu.
Tap Settings.
Tap Reset/Delete.
Tap Keep Existing Lock Code.
(Note: The default lock code is the last 4 digits of the phone number.)
Tap Reset Phone.
Tap Reset.
Once the phone restarts, it will need to be set up for the first time.