The ability to prevent incoming communication from unidentified sources on a mobile device provides a method for users to manage unwanted disturbances. For example, an individual can configure their device to automatically reject calls from any number not present in their contact list, thereby mitigating potential spam or harassment.
This feature offers increased privacy and reduces the likelihood of being targeted by unsolicited marketing or fraudulent schemes. Historically, reliance on third-party applications was necessary to achieve this functionality; however, modern operating systems now typically include this capability as a standard security measure.