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You can use reverse lookup to identify the owner of an unknown telephone number on your caller ID. Too often, telemarketers can use different unknown numbers in an effort to solicit your business. Without the name, you can enter the telephone number into a reverse lookup directory. If the number is listed, the directory will identify the owner as a business or a residential number. Then, you can determine if the caller will receive a call back from you. Also, if you determine that the number is from a person or business that you do not know, you can block the number if repeated calls to your house are made.