How about offering a 'nice' auto-block of 242, 246, 264, 268, 284, 345, 441, 473, 649, 664, 670, 758, 767, 784, 787, 809, 829, 867, 868, 869, 939 area codes unless somehow expressly requested to be authorized. Might save some mighty big billing surprises from NANPA countries other than Canada and the U.S.A.