International format of a phone number is the format that some one from out side of your country used to call your number or the format that you use to call some one who live in another country.
Basically a phone number is composed of 4-5 portions. For example :
0044(0)20 8745 5555
00 - IDD Prefix
44 - Country Code
(0) - NDD Prefix (National Direct Dialing Prefix) - Used to call from one city to another city within a Country.
20 8745 5555 - Area Code + Subscriber Number
In the international format, the NDD prefix which is used within the country to call from one area to another area will NOT be used. Insted, we use the portions shown below.
IDD Prefix + Country Code + (Area Code + Subscriber Number)
* The NDD prefix and the IDD Prefix are varies from country to country. Here you can find more dialing rules.
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