Comcast is going to start selling wireless phone service

Comcast leapt into the cutthroat market for cellphone service by unveiling Xfinity Mobile, a move that other cable companies are expected to follow as consumers' rising Internet consumption increasingly pits providers of home and mobile broadband against each other. The company will offer its Xfinity customers two wireless options: one for unlimited data that costs from $45 to $65 per line a month, and a pay-as-you-go plan for $12 per gigabyte. The service will be available to customers starting in the second quarter, Comcast said.

The new offering is aimed at helping Comcast compete outside the home as Americans' Internet usage increasingly shifts to mobile devices. The cable company's service relies primarily on Comcast's network of 16 million public Wi-Fi hotspots for connectivity, allowing users to surf the Web, watch video and listen to streaming music on their phones without paying for cellular data. Where the company's WiFi signals are unavailable, Xfinity Mobile will connect to the traditional cellular network owned by Verizon, which Comcast is using as a result of an airwaves agreement signed several years ago.