Choose to Refuse lets you bar incoming calls from up to ten numbers. You can check how many you are currently barring by reviewing your barred numbers list. To see how to do this, go to Choose to Refuse instructions.
Unfortunately, we cannot bar calls when the caller withholds their number.
If you dial 1471 and hear the message 'we do not have the caller's number to return the call', then it's not possible to bar that number.
This can happen when the caller is dialling you from a switchboard (so it may be a call from a large company, for instance) or if the caller is dialling from a fixed-line number abroad.