Abstract Unwanted calls from unknown, spam, or private numbers are a pervasive issue in the digital age, leading to privacy concerns and daily disruptions. For users of Samsung Galaxy smartphones, the operating system (One UI, based on Android) provides robust, native tools to filter and block such communications. This paper outlines the standard methods available on most modern Samsung devices, focusing on the "Block unknown callers" feature, Hiya-powered spam protection, and Do Not Disturb modes. Introduction Samsung is the leading manufacturer of Android smartphones globally. Its custom interface, One UI, integrates directly with Google's Phone app and Samsung's own services to offer layered call management. Unlike third-party applications, these native solutions do not drain battery life or require intrusive permissions. This guide covers three primary techniques, ranging from total blocking of all unidentified numbers to selective spam filtering. Method 1: Blocking All Unknown/Private Numbers (Strict Filter) This method blocks any call where the number is not saved in your contacts, not on your call history, or is specifically marked as "Private" or "Unknown."