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WiFi access points that provide Internet access to users have been steadily increasing in urban areas. Different access points different from one another in terms of services that they provide, including available upstream and downstream bandwidths, overall network capacity, open/blocked ports, security features, and so on. However, there is no reliable service available at present that can aid a user in selecting an access point from the many that are available. This paper presents xylophone, a WiFi locator service that enables users to select commercial hotspots in accordance with the current quality of service of hotspot access points.
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