Nuisance calls are any phone calls that are unwanted, persistent, and ignore official attempts to deter them. They are often from fraudsters who are out to get your money. They can also be revenge calls from stalker-types like an ex-partner or an unwanted admirer. Whatever their source the calls are annoying and upsetting. For most people a phone is an essential lifeline so they feel obliged to answer it. Nuisance callers invade your safe place and make you feel vulnerable..