the best and only thing Apple can do is offer Free in-store servicing to fix the phone (hopefully a simple task) at both Apple stores and AT&T.
though, tbh, they should just send anyone who has an effected phone, a replacement. so what? it will cost like a billion dollars? who cares, thats a small one off hit, money isn't important to apple, THE CONTINUING SUPPLY OF IT IS!
and imagine how much a response like that would just DOMINATE on a PR level, and THATS what really matters to them.