Who's Calling + SPAM Guard is an Android call screening and spam blocking app. When an unknown number calls, the app answers with a prompt asking the caller to identify themselves. The caller’s speech appears as a live transcript on the user’s screen while the phone is still ringing. The app can also show the caller’s country of origin, the language they are speaking, and a spam risk score based on a global database of reported numbers. Contacts are not screened and continue to ring as usual. After reviewing the transcript and caller information, users can answer the call, block and report the number, or send the transcript to an inbox for later reference. The app supports transcription of callers speaking in different languages and translation into a language selected by the user. A live transcript requires mobile data or Wi-Fi, and translation is processed on the device using downloaded language packs. The website states that caller audio is not recorded or saved and that contacts, call logs, and personal data are not stored or sold. The app is intended for people who want to assess unknown calls before answering, including business users handling enquiries, people who are unable to speak or hear the call, and those who need to screen calls during meetings or other quiet settings. The website advertises a free 10-minute trial in seven countries.