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A simple system providing location-based service is proposed in this paper. The major advantage of the system is that, unlike the similar services provided by mobile operators which typically use trilateration calculation to derive location from multiple based stations, the authors' proposal relies on a location server to store the location information of subscribed users. Therefore, it can be easily implemented and maintained without the involvement of mobile network operators. Though this simple design is only able to provide an approximate user location, it can be used to learn places people visit in their everyday lives, making it suitable for tracking whereabouts of the users' children, elderly, or the people they concern with.
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