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Proliferating mobile phones provide a foundation for revolutionary innovations in people-centric computing. Numerous applications are on the rise, many of which exploit the phone's location as the primary indicator of context. Existing physical localization schemes based on GPS/WiFi/GSM have been shown to achieve, at best, localization accuracy of several meters. This paper argues that such accuracies may not be sufficient for several location based applications. For example, while transmitting location based advertisements to mobile phones, it is important to learn whether a mobile phone is in a grocery store, or in the adjacent coffee shop. Small errors can place the phone on the wrong side of the partition, affecting the application.
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