Got a call from this number; an usual automated voice call for marketing & promotion of a credit card. When I cut the call, got an idea.
Mobile phone manufacturers & UI designers can add two buttons in the Call app: 1.Spam 2.Block.
When we get unwanted calls & messages, instead of End / Delete button, we can choose either Spam or Block. It will not only delete; also mark as spam; also block the number. It will save lot of time.