1 IntroductionThe proliferation of smartphones has increased the ability of organizations to contact individuals at any time and in any place. From the perspective of marketers, mobile devices serve as a new medium that exposes consumers to advertising on the device they carry with them very often or even always (Bruner and Kumar 2007). The key is to “provide the right content in the right format to the right person at the right time” (Tam and Ho 2006).Because smartphones are typically equipped with GPS (Global Positioning System) functionality and other sensors, these devices hold the potential for advertisers to provide information to consumers at places with a particularly high and positive advertising effect (e.g., when a consumer is in the proximity to a place where an advertiser’s products are available) (Bruner and Kumar 2007).