When did the Vatican become an independent city-state?
Vatican City
The City is served by an independent, modern telephone system named the Vatican Telephone Service,[92] and a postal system that started operating on 13 February 1929. On 1 August, the state started to release its own postal stamps, under the authority of the Philatelic and Numismatic Office of the Vatican City State.[93] The City's postal service is sometimes said to be "the best in the world",[94] and faster than the postal service in Rome.[94]