While you wait for answers, we may have found some information which could help you.
Success
Message
Bt 4600 phone?
How can I mend my BT4600 (1+1) phone?
Problem with handsets?
How can I repair my phone?
My bt freestyle phone don't ring or con?
How do i clear the TAM?
TAM FULL on Binatone 1420 Single, base holds old messages th?
Battery cover?
How can i get my handset to speak with the caller?
BT Studio 4500 cordless telephone?
BT 4600 phone problem?
BT 4600 twin one handset bot ringing?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cordless phones.