A telephone number that prevents caller identification from being transmitted to the recipient of a call is often termed private or blocked. This feature is implemented to safeguard the privacy of the caller, preventing the display of their number on the recipient’s caller ID device. For example, dialing *67 before placing a call in many regions activates this blocking mechanism, ensuring the number remains unseen by the callee.
The ability to conceal one’s phone number serves several key purposes. It offers a layer of security, particularly when contacting unfamiliar parties or businesses. This functionality also has roots in historical concerns surrounding privacy and the desire to control personal information shared during telephone communications. The option to maintain number confidentiality provides a sense of empowerment and reduces the risk of unsolicited contact or data collection.