Keeping up with the AT&T&T-Mobile (future) juggernaut, Sprint has just added a direct carrier billing option for its Android customers. The same courtesy has already been extended to T-Mobile users of Google's OS back in 2009 and then to AT&T in 2010, and now Dan Hesse's crew is joining in on the credit card-hating action. Right now, this new payment option is only for splashing cash in the Android Mar
