Unplug network cable from wall or phone, whichever is easiest to get to. Plug it back in and press the up and down arrow keys (volume) at the same time until the menu options come up. First will be "Network Parameters?" Use pound to answer NO until you get to "TOOLS AND FEATURES" select * for YES, you will see ERASE PIN? come up. Select # a few times until "RESTORE DEFAULTS?" come up... select * and follow go along from there.