 This was accomplished by adding the digit codice_1 to the beginning of any phone number that started with a codice_1 (government and semi-government connexions), and adding the digit codice_3 to any phone numbers that did not start with the number codice_1.It is common to write phone numbers as (0xx) yyyyyyy, where xx is the area code.The 0 prefix is for trunk (long-distance) dialling from within the country.