The decision applies only to Apple's smartphone and is supposedly based on the "evaluation of customer expectations." Curiously the FCC is considering a proposal to formalize network neutrality principles, which would extend to wireless networks, and AT&T's reversal fits nicely into those rules. Furthermore, the government agency has been looking into carrier's business relationship with Apple to determine whether or not anti-competitive behavior has taken place.
AT&T's change in policy has no effect on Apple's rejection of the Google Voice application for the iPhone, nor it means that video streaming or other high-bandwidth applications over 3G will be allowed. Still, itís an important step towards a more open model.