RadioShack said Monday that it is ending its mobile-phone marketing agreement with Target after failing to come to new terms with the retail chain. RadioShack had staffed kiosks within Target outlets since 2010. Meanwhile, Wal-Mart is offering unlimited talk, text and data for $45 a month through its Straight Talk Wireless service for the iPhone. New customers will have to buy an iPhone at full price from Wal-Mart, with the option splitting the price into $25-a-month installments.
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