I wish (and I bet there's something on Android for this) that there was some kind of social app just for sharing scam numbers among trusted friends†. E.g., as your phone receives a call, it'd hash the number and compare it with you and your friends' reported "spam caller network". If you or your friends have marked something as a spam-originating number (number spoofing not withstanding, yesyes), it would either drop the call outright, or highlight it as potential spam call ("5 of your friends have marked this as spam!") before you need to pick up.<p>† Why just among your friends? Cos we all know that the minute you make it open to everyone, the marketing and MBA folks will get their fangs in it and monetize and data-mine.