I've mostly stopped answering phone calls from numbers I don't recognize. I've completedly stopped answering unrecognized numbers from 415- and 650- area codes.

I've mostly stopped answering phone calls from numbers I don't recognize. I've completedly stopped answering unrecognized numbers from 415- and 650- area codes. I don't mind being contacted via LinkedIn, email, Twitter, etc, but cold-calling me is a strict no-no. I've got this written in bold text on top of my LinkedIn profile but yet some still insist.