World Phone module implements a CCK field for entering international phone numbers with country codes.
Administrators may add one or more phone number fields to any node type. When entering phone numbers, a site's users may select country codes from a dropdown list of countries, or include them with the typed number itself by prefixing it with a "+" sign.
The labels for the "Title" and "Body" fields (whatever you decide to label them for a given content type) do not get translated in node.module or node.pages.inc.