By Roger Cheng After several promotions aimed at winning over new customers, Sprint is looking to reward its own base.

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Source:: http://cnet.com.feedsportal.com/c/34938/f/645093/s/3f721bd1/sc/46/l/0L0Scnet0N0Cnews0Csprint0Eexisting0Ecustomers0Ecan0Elease0Ean0Eiphone0E60Efor0E50Ea0Emonth0C0Tftag0FCAD590Aa51e/story01.htm