The document discusses how calls are becoming an important digital currency and marketing channel. It argues that most purchases made on mobile devices are not tracked as web or e-commerce transactions. The document provides advice for different types of businesses on why and how they should target calls from mobile advertising. It shows that mobile advertising is driving more qualified calls than desktop and highlights the importance of measuring the value and quality of different call sources and channels. The document promotes paying per qualified call advertising solutions for better measuring and optimizing call campaigns.