Specialized version of .download_media() for contacts.
        Will make use of the vCard 4.0 format.

def _download_contact(cls, mm_contact, file):
        """
        Specialized version of .download_media() for contacts.
        Will make use of the vCard 4.0 format.
        """
        first_name = mm_contact.first_name
        last_name = mm_contact.last_name
        phone_number = mm_contact.phone_number

        # Remove these pesky characters
        first_name = first_name.replace(';', '')
        last_name = (last_name or '').replace(';', '')
        result = (
            'BEGIN:VCARD\n'
            'VERSION:4.0\n'
            'N:{f};{l};;;\n'
            'FN:{f} {l}\n'
            'TEL;TYPE=cell;VALUE=uri:tel:+{p}\n'
            'END:VCARD\n'
        ).format(f=first_name, l=last_name, p=phone_number).encode('utf-8')

        if file is bytes:
            return result
        elif isinstance(file, str):
            file = cls._get_proper_filename(
                file, 'contact', '.vcard',
                possible_names=[first_name, phone_number, last_name]
            )
            f = open(file, 'wb', encoding='utf-8')
        else:
            f = file

        try:
            f.write(result)
        finally:
            # Only close the stream if we opened it
            if isinstance(file, str):
                f.close()

        return file