Wifi San Francisco, Chicago and Cincinatti already ditched their plans to transform into one big wireless hotspot, but there may still be hope in the city of brotherly love.

Three years ago, the mayor of Philadelphia announced a plan to launch the first major city-wide WiFi network in the US. But now the project is running behind, and the provider that won the contract, Earthlink, may be looking to sell its municipal WiFi business. At this point the network is 75 percent complete, and Earthlink has said it will finish the job.—Gregory Mone 

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