Uniden DECT 2035 Series - Manual (Page 7)

6
Resetting the Handset
If you want to register the handset to a different base or replace
a handset with another one, you must first clear the registration
information from the base and the handset.
Press and hold 1) END and # for at least five seconds, until the
SYSTEM RESET menu appears.
Select the Deregister HS
2)
submenu by pressing MENU/
SELECT. Which Handset?
appears in the display.
Use
3) or to select the
handset ID to be de-registered from the list, and then press
MENU/SELECT. Deregister HS appears.
Press
4) to move the cursor to Yes, and then press
MENU/SELECT. You will hear a confirmation tone.