If you're an AT&T mobile customer, and you have some extra bitcoin lying around that you're not doing anything with, you can now use it to pay your phone bill.AT&T just became the first big US wireless carrier to announce that its customers can now use cryptocurrency to make payments, as greater acceptance of this digital medium of exchange can be seen at companies ranging from AT&T to cable provider Dish, which also lets its customers pay via cryptocurrency. Likewise, Facebook on Friday garnered headlines over a report that it's set to launch its own cryptocurrency for use on the social network early next year.About AT&T's move, all customers need to do is select the BitPay option at MyAT&T. BitPay is an Atlanta-based bitcoin payment service provider, and it's also worth noting: This is an option that only currently works online and via the myAT&T app, so it's not as yet available for in-store payments."We're always looking for ...