Internet service provider EarthLink now plans to team up with search giant Google in a proposal to offer Wi-Fi to San Francisco residents, a move that's likely to add credibility to a movement by cities to promote Wi-Fi services.

EarthLink said on Tuesday the companies submitted a joint proposal that plans to offer a two-tiered business model that combines a free slower service, offered by Google, and a paid service for higher speeds, to be offered by EarthLink.

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