j'ai vu ceci :

In countries participating in the North American Numbering Plan, such as the United States, Canada, and some Caribbean nations, this number is dialed as 011 61 2 3456 7890, with 011 being the international call prefix for the NANP and 61 being the country calling code of Australia. From most of the rest of the world, the international access code is 00, so that the call is dialed as 00 61 2 3456 7890, as recommended by the regulations of the ITU. (For Australians who wish to dial international numbers, the international access code when calling from Australia is 0011.)
https://en.wikipedia.org/wiki/International_direct_dialing

011 au lieu de 00, y a t-il d'autres zones qu'US/canada/AU où c'est pas 00XX pour remplacer le +XX?
est ce que certains ont noté ces différences lors d'itinérance à l'étranger?
pourquoi est ce comme cela?

merci