Sprint Nextel Corp. continues to improve its call quality, bucking an industry trend, but still trails Verizon Wireless, according to a semiannual J.D. Power and Associates study released Thursday. Sprint averages problems with 10 calls in 100, the survey found, slightly better than the industry average of 11 in 100. Sprint’s scores improved since six months ago, when 13 calls in 100 were ...
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