Three of the nation’s largest cable companies are quietly pulling the plug on a joint cell-phone venture with Sprint Nextel Corp., called Pivot.

Spokespeople for Comcast Corp., duration Warner Cable Inc. and Cox Communications Inc. said Wednesday they have stopped marketing the Pivot service and plan in the coming weeks to give their Pivot customers the option of switching to traditional Sprint mobile phone plans.

A spokeswoman for the fourth cable partner, privately held Advance/Newhouse Communications Inc., declined to comment.

Pivot customers will be able to keep their phones and their numbers and receive a month’s free Sprint service for their trouble. They’ll plus be given a set period once they’ve switched by to cancel their contract without penalties.

Announced with great fanfare in November 2005, the four cable partners and Sprint each invested $100 million in the venture. The Pivot make was unveiled a year ago.

The partnership’s goal was to give the cable operators a “quadruple play” of

voice, video, World Wide Web and wireless products in their battle against telephone companies that have added TV to their arsenals.

But the cable companies said the complexity of the offering itself, as well as meshing what was essentially a retail operation with their cable service, made marketing Pivot a chore and controlling the direction of the joint venture difficult.

“We remain committed to bringing a wireless component to our portfolio of services, but we don’t believe Pivot was the best option,” said Cox spokeswoman Jill Ullman.

The cable companies refused to say how many customers they had signed up through Pivot, but each said it had launched the service in a limited number of markets.

instance Warner Cable spokesman Alex Dudley added that it’s still unclear how critical wireless services are in keeping customers from jumping to other providers.

“Wireless in some format may be part of our portfolio, but we…

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