Having rolled out to T-Mobile just about a year ago, Google's celebrating the anniversary of its Android Market carrier billing feature in the US by expanding the service to AT&T. Put simply, this means that if you're using an Android device on an AT&T line, you'll no longer need to use a credit card -- you can just bill your purchases straight to your AT&T bill, which is painless almost too painless, really, if you're the compulsive type. And no, we're not aware of a way to bill a Froyo update for your
