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AT&T: 'Fine Tuning' Still Required Before Offering Internet Tethering Via iPhone
An [sic] spokesman for the wireless carrier, however, said that tethering remains unavailable and stuck with the company's prior statement: "Whenever we offer new features, we want to offer the best possible customer experience. For tethering, we need to do some additional fine tuning to our systems and networks so that we do deliver a great experience."
He declined to say when it would be available, though Ralph de la Vega, who runs AT&T's wireless unit, has previously said that iPhone tethering would be possible sometime this year.