OK, so AT&T wants to screw around? Here's a modest proposal:
What are we allowed? 4GB a month? I suggest we all use every last bit of bandwidth we can, right up to the limit. And all of us post it and ask every iPhone owner we know to do the same.
Someone before you suggested the same thing, so I'll post the same response for you: this would only serve to make At&T's point that their network can't handle the extra load. You won't gain anything by doing this, except make other iPhone users that actually use their phones for work more frustrated than they already are.