AT&T has teased iPhone users a few times by putting up notices of free wi-fi at AT&T hotspot, only to pull them down hours later after the blogosphere (and usually us!) got excited, thus alerting them to their mistake.  While the apparently miscues seem to point to them working on such a feature, it appears the fact that the free access is still hackable might be the sticking point.At the same time, the Zune, which does have wi-fi, but does not have a browser, has managed to strike a deal with Wayport,