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 or made using a BT Chargecard.
- 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#.
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