Step 3: No Caller Display
Make sure you have not accidentally blocked the Caller Display Signal at your BT TwinTalk.
It is possible to set up your BT TwinTalk to block the Caller Display signal to your phone. If your phone never displays the number of your caller when connected through TwinTalk and always displays it when connected directly to your telephone socket then it is possible that you have accidentally blocked the Caller Display signal at your BT TwinTalk. To reset your BT TwinTalk and to restore the Caller Display signal, visit the Restoring the Caller Display Signal page.