Thanks for your reply, my thought exactly. It is registered to the base, I tried changing the pin On the Dect base, no change, unregistered the handset, then register the handset again, still the pin does not change in the handset to reset it and clear the handset to default. I know the default pin is 0000. I changed the pin in the Dect base to another number, It will register to the base, but the pin to reset the phone will not change. Appreciate your reply.