Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_22910 ( "Carrier" text, "Standard" text, "Frequency" text, "Connection speed" text, "Launch date (dd.mm.yyyy)" text )

### Question ###
When the launch date is 14.09.2005, and the frequency is 900mhz and 1800mhz, how many carriers are there?

### Accurate SQL ###

SELECT COUNT("Carrier") FROM table_22910 WHERE "Frequency" = '900MHz and 1800MHz' AND "Launch date (dd.mm.yyyy)" = '14.09.2005'