Predicate Proposal - Сountry Dial-in Сode

Field Name: Сountry Dial-in Сode

Definition: Dial-in code is a telephone number prefixe attributed to a particular country or territory - member of the International Telecommunication Union (ITU).

Also known as: Country calling code

Type of value: String

#of accepted values: single

Citation Required?: yes. The list of the Dial-in Codes can be found on the official site of the International Telecommunication Union.

Examples of proper use:

France → ‘Dial-in Сode’ → +33 Citation

Zimbabwe → ‘Dial-in Сode’ → +263 Citation

Examples of improper use:

France → ‘Dial-in Сode’ → +262

This is incorrect because +262 Dial-in code corresponds to the French Departments and Territories in the Indian Ocean and not to the mainland France.

Constraints: Only applies when Subject has the “Is a” value “Country"

Usage in other schemas: Wikipedia

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This is an interesting proposal - I like it! Is there a more standardized name than “Dial-in code”, though? Maybe something like “Country Code (Telephone)”?

Yes, I think this predicate does work

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The Telecommunication Union uses Country Code or National Numbering Plan.
Dial in code I found in a UK telephone directory.
Wikipedia uses Country Calling Code
So I do not know which one would be a more standardized name, tbh.