I have documented all my calls over the last 5 years.
I have found that not one single call of any thing of interest to me has come from any of these numbers.
After 5 years of logging and researching the calls that I receive, I block most numbers because most calls are not genuine. In fact, these calls are from scammers and telemarketers or fisching to find a valid phone number to sell to other scammers and telemarketers.
The days of yesteryear of answering your phone because you expect that some one you know is calling to talk to you because they want to talk to you is over. Caller ID and screening are self-protective musts.
The fact is:
The technology of phone system has abandoned all of us and allowed anyone and everyone unregulated and uncontrolled access to us. The US government has been totally useless in this regard.
It is up to us as individuals to be constantly on guard and use the technology available to track, block and report the miscreants that are, in fact, attacking and assaulting us through our connection to the world from our homes… the phone… the wireless… the Internet….
We, our lives, our children, our communications, and our finances, everything are under attack and have been for years.