Telephone numbers in Monaco are eight digits in length, with fixed line numbers beginning with the digit 9 and mobile phone numbers with the digit 4. Until 21 June 1996, Monaco formed part of the French numbering plan, with fixed line numbers beginning with 93, but in that year the principality adopted its own country code +377. Consequently, all calls between France and Monaco had to be dialled in international format, including those to and from surrounding areas in France. From Monaco to France 00 33 x xx xx xx xxFrom France to Monaco00 377 xx xx xx xx