While you wait for answers, we may have found some information which could help you.
Click here for Dial Phone PressBT 4600 twin one handset bot ringing?
Battery cover?
How can i get my handset to speak with the caller?
How can I mend my BT4600 (1+1) phone?
Bt 4600 phone?
TAM FULL on Binatone 1420 Single, base holds old messages th?