23rd September 2014 10:39 AM
If you have a telephone that can display caller ID information, you can choose whether to view information about a caller's identity before answering the call. The caller's number may not be displayed, regardless of your setup, under the following circumstances: - Calls from outside the UK. - Calls from some other networks, including mobile networks. - Calls made from some payphones. - Calls where the caller has withheld the calling number. To check whether your telephone is set to display the caller's identity, dial *#234#. To display the caller's identity on your telephone, dial *234.
If you have a telephone that can display call waiting with caller ID information and you are in a call, if another call comes in, their telephone number is displayed at the same time as the call waiting tone is played. To hide the caller's identity on your telephone, dial #234#.