Users opt in for the caller identification service, also known as caller ID, through their landline, cellular or voice over Internet telephone service. Then, users identify calls before answering based on the callers' name or telephone number.
Caller ID works by displaying the calling number from a provider's switch. Some services also display the callers' name. The service requires a phone equipped to display numbers and or names. Caller ID phones are easy to find at many retailers. The service is popular for screening calls from unfamiliar or unwanted callers. Caller ID's popularity has led to a practice called spoofing.
Spoofing is the fraudulent use of computers and phone numbers to obtain personal information via caller ID. By not returning these calls or not giving our personal information, users avoid fraud schemes. Such calls can be reported to the Federal Communications Commission.