Calldorado is a free SDK that enables developers to monetize their app through caller ID. By integrating the SDK into their existing mobile app, developers can offer caller identification as an additional feature in their app or game, and at the same time increase user engagement and generate incremental revenue from ads on the caller ID screens. The advertisements are always shown in connection with caller ID information and are contextually relevant to the user’s call behavior.The Calldorado SDK works whether the host app is open or closed, as the SDK runs in the background and is triggered by phone calls. This way even inactive users who have stopped using an app can be monetized. Prompting the user with caller ID in the look and feel of the host app, and encouraging the user to get back into the host app through deep linking, stimulates user engagement and retention.By combining additional app features (caller ID), with targeted advertising and direct incremental revenue, the Calldorado SDK enhances the user experience and drives higher engagement and monetization rates to any app.As phone calls are still among the top user activities on smartphones (source: GSMA intelligence, Zokem), the opportunity to display contextually relevant ads in connection with phone calls is enormous. On average, 150 phone calls can be turned into a caller ID screen per-user per-month. With an ad displayed on each caller ID screen the Calldorado SDK substantially increases the ad-impressions and ad revenue that an app can generate.