Caller ID Spoofing according to wikipedia.

Caller ID spoofing is making the telephone company to display a number on the recipient’s caller ID display which is not that of the actual originating station; the term is commonly used to describe situations in which the caller is pranking or disguising the caller id. Just as e-mail spoofing can make it appear that a message came from any e-mail address the sender chooses, caller ID spoofing can make a call appear to have come from any phone number the caller wishes. Because of the high trust people have tended to have in the caller ID system, spoofing can call the system’s value into question.

Caller ID Spoofing is changing your caller id to any number you want. You can disguise your caller id and make any number you want show up on a caller id. How to spoof a caller id for free.

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