If you have caller display enabled on your landline account you should get the number phoning you showing.
Is your phone showing this?
Does your phone have an address book? If so adding people to this with their phone number should display the person calling.
Numbers not in your address book cannot show the name of the caller.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
