This report highlights the key principles of mobile experience that marketers must weave into the process of crafting mobile marketing strategies. As more people own and use smartphones than ever before, a mobile marketing strategy is crucial for any marketer. But to be successful, marketers must, at each phase of mobile marketing maturity, hew to the three key principles of immediacy, simplicity, and context. This is an update of a previously published report; Forrester reviews and updates it periodically for continued relevance and accuracy. We substantially revised this edition to factor in new examples and recommendations.