The process of preventing calls from unidentified or withheld numbers on Android devices involves utilizing built-in phone application features or third-party applications. This effectively stops incoming calls where the caller’s identification is deliberately hidden, typically displaying as “Restricted,” “Private,” or “Unknown.”
Blocking these calls can significantly reduce the incidence of spam, robocalls, and potentially unwanted or harassing communications. Historically, managing these types of calls required specialized services or was not possible, but modern smartphone operating systems now provide tools to address this issue directly.