AT&T's been feeding us a story that it'll offer MMS on the iPhone only "once [it completes] some system upgrades that will ensure our customers have the best experience," but here's the thing: it seems that it works right now -- if you've got a build of OS 3.0 that'll let it. None of us have been able to get it going ourselves, but we've been sent screenshots from a tipster that seem to indicate that both MMS and tethering are in full effect on the network, so there doesn't seem to be a network restriction involved (we can't verify whether the build we see here was tweaked, so we're thinking there might be some hackery in play). The strategy for ultimately deploying the features to AT&T customers is unclear, but seeing how some folks in Euro
