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Comcast, which has its Midwest headquarters in Schaumburg, has launched Xfinity Wi-Fi in the Chicago and suburban area. Comcast customers can access about 100,000 hot spots nationwide, including more than 1,000 in Chicago and the suburbs for free, said company spokesman Jack Segel. "So many people use our service on mobile devices and download and stream content on the go. It only made sense to provide it now," he said.