Skype said in a blog post (with a brief video interview) that Apple's iPhone OS 3.2 update, currently available for testing with developers, provides the changes necessary to allow voice-over-IP calls using a 3G connection. Apple had previously not allowed this, but U.S. regulators pressed for a change, which Apple has made. Skype says the new release will come when it is confident of its software's capability to make high-quality calls. 
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Skype Plans VoIP in 3G in Next iPhone Release
