The nature of GCHQ's business means that we will not usually connect external calls unless the caller has a name or telephone extension to provide to the operator.
However, you can use the following contact details:
Press Office/Public Affairs
Email: pressoffice@gchq.gsi.gov.uk
Telephone: 01242 221491 x 33847
Address: Press Office, Room A3a, GCHQ, Hubble Road, Cheltenham, GL51 0EX