00 isn't part of the country code, it's a commonly used international access prefix. Telephone country code +1 is North America, including the USA and Canada and several island nations and territories, mostly in the Caribbean. Telephone area code +1 212 is Manhattan, New York City, New York.
Since different countries use different international access prefixes, it is much less confusing to write international telephone numbers beginning with the plus symbol and the telephone country code, omitting any access prefix. In this example, there are some countries that use 001 as the international access prefix, which would change the question to country code +212, which is Morocco.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The territory of Western Sahara is occupied and controlled by Morocco, so it uses Morocco's telephone country code +212.
'00' is not part of the country code, it is a commonly used international access prefix. Country code +212 is Morocco, and +212 6 is a mobile.
It stands for the telephone area code for Manhattan, NYC. "I was in the 212" means "I was in Manhattan".
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
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Country code +57 is Colombia.
Country code 52 is Mexico.
Fiji has telephone country code +679.
Gibraltar is country code +350.
Moldova is country code +373.