DENVER — Qwest began a 14-state ad campaign Sunday seeking to lure customers of AT&T’s long-distance service.

Last week AT&T announced it would stop seeking new residential customers, though it would continue to serve existing ones.

The ad campaign features a letter from Qwest CEO Richard Notebaert promising long-distance users that they can count of his company to keep its long-distance service «and continue to invest in our world-class network…»

Notebaert said, ’It’s kind of an open-ended letter. It is really addressed to customers who might have left Qwest to go to AT&T or other carriers."