SELECT COUNT(carrier) FROM table_19246_1 WHERE frequency = "900MHz and 1800MHz" AND launch_date__ddmmyyyy_ = "14.09.2005"
Ketika tanggal peluncuran 14.09.2005, dan frekuensinya 900MHz dan 1800MHz, berapa banyak operator?
CREATE TABLE table_19246_1 (carrier VARCHAR, frequency VARCHAR, launch_date__ddmmyyyy_ VARCHAR)