Iso3166 class may need to be renamed to fit its purpose better.

The ISO3166 standard actually have nothing to do with phone numbers. It is about country identifiers in two letters (alpha-2), three letters (alpha-3), three digits (numeric-3), and country names. So, **possible mobile number prefixes** and **possible phone number lengths** are not part of ISO3166. It actually took me a while to figure this out at the beginning.

In case of any future confusion, we may need a better name for it.

Locate the Iso3166 class and review how its name relates to the country identifiers, phone-number prefixes, and phone-number lengths it exposes. Check the repository for references to the class, then determine and document an appropriate scope for renaming it; the issue does not specify a proposed replacement name or tests.

Written by the indexing model from the issue text.