This assistance prevents your number from being displayed to anyone you call. By utilizing CLIR, the individual calling cannot recognize you. This administration activation and use are free. At the point when a number is retained, there could be no caller ID, which implies the recipient cannot see who is calling. A number can be withheld during digital, voice-over-IP (VoIP) telephone calls. The procedure of withholding a number is known as Calling Line Identification Restriction (CLIR).