Monaco and Andorra Until 1996, Monaco formed part of the French numbering plan, with eight-digit numbers beginning with 93, but in that year the principality adopted the country code 377. Consequently, all calls from France to Monaco must be dialed in international format 00 377 xx xx xx xx, while calls from Monaco to neighbouring areas in France similarly must be dialed as 00 33 4 xx xx xx xx. In 1994, Andorra had similarly adopted its own country code 376, replacing access via the French numbering plan (+33 628 xxxxx).