It is not simple subject.
Because of our former life style - we were getting 20+ soliciting calls daily.
Add 7-20 junk letters every day.
So going on retirement we switch to magic jack and use call blocking feature few times.
Knowing how our friends call, having them listening to the messages and dialing additional number WILL Be a problem.
So is answering only numbers you know. We just visit friends in California and leaving wanted to call one of them to say final arrangements.
She knew our home number, my cellphone number, but ignored my wife calling from her cellphone.
That lead to some troubles, so no recipe works on everything.
To add to the troubles - about 2 out of 10 of our friends bother to list their name with phone company, so unless you program them on your phone, the caller ID will show blank, or display the number for the name.
Few years ago my mom's car broke down and she tried to reach my father calling collect from public phone.
Father promptly ignored the calls as it show "unknown" coming from ATT operator.
