00 isn't part of the country code, it is a commonly used international access prefix. Country code +30 is Greece, but there are no valid numbers beginning with +30 1. However, Athens used to have area code +30 1, but a number that used to begin with +30 1 now begins with +30 210, with 7 further digits.
(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.)
Telephone prefix 003 is not assigned to a specific country; instead, it is often used as a prefix for international calls that begin with "00," which is the international dialing code in many countries. When followed by another country code, it indicates the specific destination. For example, dialing 0031 would connect you to the Netherlands.
Leichtenstein is telephone country code +423.
Yes, the country code +003 is associated with Italy, specifically when dialing from certain countries. However, it is more commonly recognized as +39, which is Italy's international dialing code. The prefix +0039 may be used in some contexts to indicate the country code for Italy.
where is telephone country code 1816
That is not a country code.
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.
Slovenia is country code +386.
Vanuatu is country code +678.