Don't gossip about sensitive people or projects on the telephone. Keep a pad and pen next to the telephone. Jot down details of threatening or suspicious calls immediately. Note the time, date and keep a file. Don't waste time worrying about phone taps or imagining that strange clicks or hums or other noises indicate a phone tap.
Many taps are virtually impossible to detect.
Trust your instincts. If you think your phone is tapped, act accordingly. Mail Get a mail box through the United States Post Office or a private concern. Be aware that the Post Office will give your street address to inquirers under certain circumstances. If you receive a threatening letter, handle it as little as possible.