The process for calling Antigua And Barbuda from Andorra is as follows:
-Dial the international access code for Andorra, which is 00
-Dial the country code for Antigua And Barbuda, which is 1
-Dial the phone number, omitting the leading zero if there is one
So, to call a phone number in Antigua And Barbuda from Andorra, you would dial 00-1-the phone number.