[Comcast launches wireless broadband service today in Portland, Oregon - more cities to follow later this year. The service uses Clearwire's WiMAX network and Sprint Nextel's 3G network.]

By Deborah Yao, Philadelphia (AP) -- "Comcast Corp. will become the first major cable TV operator to roll out wireless broadband outside of Wi-Fi hotspots as it launches the service in Portland, Ore., on Tuesday, with at least three other cities to follow this year."

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