I need to revisit the "Email and Phone Numbers in CRM" article. I wrote it a very long time ago. It is basically true but thinking specifically about Phone numbers and how they are used in screens I thought it would be pointing out where the translations are used.
If you wanted to add a new phone number called 'Test' then you would actually need to add 3 translations.
Each are used in different locations
Link_CompPhon is used in the Company Phone/Email screen.
Link_PersPhon is used in the Person Phone/Email screen.
Link_PersPhon_Comp is used in the context of the New Company screen in the section where the New Person is added.