You can also register with Silent Call Guard on the phone -
Quote:
If you have been troubled by calls where the phone rings but on answering there is no one there, you may wish to register your number on the Silent Callgard Service on 0870 4443969.
These calls are generated by automatic dialling equipment which dial more numbers than there are operators available to take the calls.
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Registration is free, apart from the phone call cost and last 12 months.