The process for calling Antigua And Barbuda from Gabon is as follows:
1. Dial the international access code for Gabon, which is 00.
2. Dial the country code for Antigua And Barbuda, which is 268.
3. Dial the telephone number, omitting the leading zero if it is present.
So, to call the Antigua And Barbuda Prime Minister’s office in St. John’s, you would dial: 00 268 762-4100.