How can I block an "unknown" caller who keeps calling me and hanging up?

Question

How can I block an "unknown" caller who keeps calling me and hanging up?

Answer 1

Depending on what kind of phone you have, and if you would be interested, some phones have the option of restricting calls. My phone is set to restrict people from calling my phone that aren't in my contact list. Go to settings, security, restrict calls.. if your phone has it, that is. Hope this helped!  

Answer 2

If you are with BT then they provide a service where they can block all withheld/unknown numbers - last time I checked it was £4 a month for the service, although if it is a nuisance call they should be able to investigate and block it  

Answer 3

dial *69 and call them back and tell them to stop calling you.

Answer 4

Best way if your service provider can block the call. Otherwise you have to just accept the call or ignore the unknown caller.