“Shares of the country’s largest wireless companies slipped on Thursday after Comcast unveiled an unlimited-data mobile phone service for as little as $45 per month,” The New York Post reports. “Comcast, the No. 2 cable operator with 22.5 million video customers as of Dec. 31, is the first major cable operator to offer a wireless alternative to Verizon, AT&T, Sprint and T-Mobile.”

The report adds: “Comcast’s service, to be called Xfinity Mobile, will be available only to Comcast customers — including those among its 24.7 million broadband subscribers who don’t get pay TV.”

The new service is expected to be a part of marketing aimed at enhancing the desirability of Comcast’s bundled services.

“The mobile service, to kick off later in the second quarter, will be carried on the Verizon network,” the report notes. “Comcast swapped spectrum with Verizon back in 2011 with a proviso that Verizon would help it down the line.”