user: Question: When the carrier is IDC, what are the frequencies?
Columns: ['Carrier', 'Standard', 'Frequency', 'Connection speed', 'Launch date (dd.mm.yyyy)']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Orange', 'GSM GPRS', '900MHz and 1800MHz', '56 kbit/s', '14.09.2005']
SQL:

assistant: SELECT "Frequency" FROM "Table" WHERE "Carrier" = 'IDC';