Call blocking is a feature that allows users to prevent specific phone numbers from reaching their devices. This can be useful for avoiding unwanted calls from telemarketers, robocalls, or individuals who may be harassing the user. Most smartphones and landline services offer options to block numbers easily through their settings. When a number is blocked, calls from that number will either go directly to voicemail or be disconnected before reaching the user. Some phone service providers also offer additional tools to identify and block potential spam calls automatically, enhancing the user's control over their incoming calls.