Tethering is still at the top of the list for many iPhone owners on AT&T's network. It's been reported in the past AT&T's own Ralph De La Vega said that AT&T-approved tethering would be available "soon"… that was in November 2008, but maybe they just have a different perception of "soon."
Fast-forward to now, and more word comes from AT&T. This time the outlook's not as promising. In a message to tech blog Engadget the carrier had this to say:
"…iPhone tethering has the potential to exponentially increase traffic, and we need to ensure that we're able to deliver excellent performance for the feature ‚Äì over and above the increases in data traffic we're already seeing ‚Äì before we will offer the feature."
Turns out they just don't think their network can support it yet, at least not to the quality they expect. True or not, that doesn't leave most iPhone owners on AT&T's network with high hopes for the time being.
Those not wanting to wait on an "official" method of tethering can always try a little workaround: Here.
Read more here: History of iPhone Tethering and AT&T Failure to Deliver