AT&T today became the second US telecom operator to provide the carrier billing support on application purchases from Android Market.
Apart from AT&T, Only T-Mobile supports carrier billing. You can simple buy any app or game from Android Market and rather than paying from your credit card, you can add the cost to the mobile bill. Easy, right.
In a blog post on Android Developers Blog, Eric Chou also remarked that Google will continue to partner with more carriers to offer carrier billing options for their subscribers.