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Caller ID is a telephone feature that displays a caller’s phone number on the recipient's phone device before the call is answered. The phone number, location and associated billing or subscriber name is shown on the handset’s display or a separate caller ID box attached to the phone. This feature is particularly useful when screening known, unknown, or unwanted calls. Unwanted calls are effectively deterred with the use of caller ID, including obscene, harassing and threatening phone calls.

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