Mobile marketing refers to promotional activities done through mobile devices. It allows organizations to interact with audiences in relevant ways using any mobile device or network. Some common mobile marketing tactics include app-based ads within mobile apps, in-game ads, QR codes, location-based ads, mobile search ads, image ads, and SMS marketing. An effective mobile marketing strategy uses the S.O.S.T.A.C. model to define the situation, objectives, strategy, tactics, actions, and controls. For example, one company implemented a strategy using shadow QR codes at lunchtime to drive sales, offering coupons and delivery to increase purchases by 58% and sales by 25% during that period.