The country code list is very long if all countries are to be listed, which raises the question of whether this can be expected of visitors.

With a database you would probably have to integrate the list using Javascript and also use PHP or NodeJS on the server. But I'm not a Javascript expert, so the Javascript experts would have to estimate how much effort would be involved.

If the number of countries is small, this could also be done manually using a small drop-down list so that visitors don't have to scroll endlessly to find their country.

The question is whether it wouldn't be easier for visitors if they only had to enter the numbers in an input field.

With a number list, visitors have to know the country code, otherwise they would not be able to select numbers from a list.

These are my thoughts on a country code list.

If you really want a very long country code list with a database connection, then wait for the Javascript experts.