[UPDATE:] It gets worse.
AT&T is much more efficient at telling me there’s an issue, so I won’t be updating the iPhone just yet. I get the above dialog relatively quickly after selecting the line on my family plan I want to upgrade. I love the touch about how you can call an 800 number if it’s non-iPhone related. What if it is iPhone related? Well, I guess you’re just screwed.
For the record, I did call the standard AT&T number, got through to an agent in about six minutes, and was politely told they can do nothing about the iPhone. They can only be pre-ordered online or at an AT&T store, not via phone.
Meanwhile, Apple takes much longer than AT&T to dash your hopes and dreams. Get used to seeing the above screen for a while.
When the crushing blow is finally received, It comes in the form of either the error above or below.
It’s a little less frustrating than AT&T because they do admit they’re swamped. With either error, it’s basically an Apple admission that they can’t deal with the volume, so try again later.