By David Adams and Francisco Alvarado MIAMI (Reuters) - Boost Mobile, part of Sprint Corp, on Thursday launched a prepaid plan for U.S. consumers calling and texting Cuba, taking advantage of new, relaxed U.S. commercial regulations with the Communist-run island nation. The Obama administration's new Cuban policy regulations approved by the Treasury and Commerce departments have opened the door for U.S.-based telecommunications firms to start potentially lucrative services to Cuba. Last month U.S.-based IDT Corp reached an agreement with Cuba's Empresa de Telecomunicaciones de Cuba SA (ETECSA) to provide direct international long-distance service. The company announced a $50 monthly plan, allowing customers to pay about $0.30 per minute, which it described as the lowest introductory rate per minute among prepaid carriers to call Cuba.

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