SELECT COUNT("Carrier") FROM table_22910 WHERE "Frequency" = '900MHz and 1800MHz' AND "Launch date (dd.mm.yyyy)" = '14.09.2005'
When the launch date is 14.09.2005, and the frequency is 900mhz and 1800mhz, how many carriers are there?
CREATE TABLE table_22910 (
    "Carrier" text,
    "Standard" text,
    "Frequency" text,
    "Connection speed" text,
    "Launch date (dd.mm.yyyy)" text
)