Oh, isn't that a happy little question! Well, telephone country code 0023 isn't assigned to any specific country at the moment. But hey, maybe it's just waiting for the right country to come along and give it a purpose. Just like a blank canvas waiting for a beautiful landscape to be painted on it.
Country codes beginning with +23 are in western Africa, but you need the next digit.
Leichtenstein is telephone country code +423.
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.
Niue is country code +683.