Sprint's presence at the nation's largest retailer has dwindled in recent weeks, according to Fierce Wireless. Some 500 Walmart stores across the country continue to sell Spint handsets, but the majority of Walmart's 4,177 brick-and-mortar locations no longer have them in stock. Wave7 Research says T-Mobile prepaid and StraightTalk have replaced Sprint in some Walmart locations, and AT&T and Verizon Wireless are now the only postpaid carriers advertised by Walmart. Sprint declined to comment on Fierce Wireless' story, but it is worth noting that Sprint acquired the majority of RadioShack's retail stores earlier this year, which are now co-branded Sprint/RadioShack. StraightTalk is one of Walmart's two prepaid brands, the other being TracFone.


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