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Nullriver, a software developer, released an iPhone application called NetShare, which enables an iPhone to be used as a portable modem for computers. Despite being a violation of AT&T's terms of service, Nullriver got it onto Apple's iTunes App Store. Over the past week, Apple took it down, reinstated it, and then took it down again. Both companies are now laying the blame at each other's doorsteps, as one blogger realized in his attempt to get a refund for his purchase. Might just want to call your credit card company to get the charge removed. That seems easier.