Wind Mobile, one of the smallest players in Canadas wireless market, said on Thursday it was offering a new low-cost unlimited U.S. roaming plan, a traditionally lucrative niche for its much larger competitors. Wind, backed by Europes Vimpelcom Ltd, said it would offer customers unlimited data, talk and text while traveling in the United States for C$15 ($13.42) a month. The offer is a direct challenge to Canadas three largest mobile operators – Rogers Communications Inc, BCE Incs Bell, and Telus Corp – who charge much more to keep their customers connected while south of the border. While wireless prices in the Canadian marketplace remain very high, we at Wind Mobile continue to challenge expectations and offer our customers real value, Winds chief operating officer, Pietro Cordova, said in a statement.