This file is located in the PrivateFrameworks folder. What application will edit it? I've only found a chinese app for windows that lacks english translation that opens it. I've already added my country code to both:

/System/Library/PrivateFrameworks/AppSupport.framework/PhoneNumberTemplates.plist

/System/Library/Frameworks/UIKit.framework/PhoneFormats/UIPhoneFormats.plist

I think the last thing I need to edit is this Default.phoneformat file I would think. I know that there's a Frank8 here who does add to the file but with what software?