Caller ID is a feature that displays the phone number, and sometimes the name, of the person calling before the call is answered. This allows the recipient to know who is calling, helping them decide whether to answer or ignore the call. Caller ID is commonly used on both landline and mobile phones, providing an added layer of convenience and security by identifying callers. In some cases, it can also show the location or service provider associated with the number, helping to identify unknown or unwanted calls.

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