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By Marina Lopes and Alina Selyukh WASHINGTON (Reuters) – With plans for a T-Mobile US Inc merger in tatters, Sprint Corp is expanding a roaming program with rural cellphone companies that could provide a much-needed way for the debt-laden wireless carrier to cheaply increase its footprint. In March, Sprint Chairman Masayoshi Son struck a roaming deal with the Competitive Carriers Association (CCA), which represents many U.S. Sprint and CCA plan to announce another batch of individual agreements to expand the roaming partnerships at an industry trade show in early September, CCA President and Chief Executive Officer Steve Berry said this week. When Son announced the mutual roaming agreement, many industry observers shrugged it off as a sweetener to soften U.S.