Verge cordless phone system v581tad

I believe you have the expansion capacity of the phone all used up. The phone cannot register any more handsets until you delete the handset registered that is not in use. First check the handsets and see what handset numbers they carry. It should be #1,#2,#3,and #4 if it does not then you will have to delete the one that is missing or if it is then delete handset #5.To do this you will have to use one of the handsets registered to the base. First Press the MENU/ OK button then scroll down to ADV,SETTING then Press MENU/OK then scroll down to DEREGISTER then Press MENU/OK. Then ENTER HANDSET PIN would show, if you have not changed the pin enter 0000 if you have enter your pin member. From the next options select HANDSET and press MENU/OK from the next set of options select the handset number you want to DEREGISTER and press MENU/OK from the next option select YES then MENU/OK. Then try to reregister the new handset To do this Press the MENU/OK button then go to ADVANCE SETTING press MENU.OK scroll to REGISTER then press MENU/OK Select the base number displayed then press MENU/OK. PLEASE WAIT will appear. Then from the base press and hold the PAGE button until the handset prompts you to ENTER PIN # .Enter 0000 OR your pin number then you will see PLEASE WAIT. A tone will confirm the handset registration.