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並前往https://www.quora.com/How-did-the-US-country-code-end-up-being-the-first-one-as-in-number-1

How did the US country code end up being the first one, as in ...

Actually the US (and Canada) does not have the country code 001, it has a country code of 1, commonly written as +1. The “00” is a common dialing prefix ...

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