Abstract: Herein is described a method and system for optimising the delivery of content to mobile devices using microzones and macrozones and their associated methodologies. The macrozone method reduces the amount of content transferred to mobile devices. The macrozone method simplifies the determination of relevant microzones. The macrozone method also reduces the communication required between server and mobile device. The microzone method simplifies calculations for determining proximity to locations and narrows the focus for delivery of information based on proximity. The microzone method combined with the macrozone method reduces the total calculations and communications required within the total system. The system is further optimised by using microtimes and microcategories. The creation and management of content relating to microzones, microtimes and microcategories is managed through a campaign management system.