Use your first initial and last name in the phone book.
When not at home, use an answering machine. Have it answer that you cannot come to the phone, not that you are not at home. Turn the ringer down so it cannot be heard from the outside.
In case of emergency, know what number to dial 911 and what to say when calling.
Don't give out any personal information if called about surveys, contests, subscription drives, purchases, or deliveries until the source of the call has been verified. Ask for a number they can be called back at and confirm with what is listed in the telephone book.
Never give your name, address, or phone number to someone you don't know.
Never give any information to "wrong number" callers, ask for the number they are trying to dial.
Always give the impression you are not alone.
If they ask for someone who is not there, say they can't come to the phone and ask for a name and number.
When you first realize the caller is obscene or harassing, hang up immediately. Do not listen to them or show any type of emotional response. Report continuing incidents to the telephone company and police.
A blast from a whistle should not be used to discourage obscene or harassing phone calls.
If all else fails, change your phone number and make it unlisted.