def phone_subcommand(search_terms, vcard_list, parsable):
    """Print a phone application friendly contact table.

    :param search_terms: used as search term to filter the contacts before
        printing
    :type search_terms: str
    :param vcard_list: the vcards to search for matching entries which should
        be printed
    :type vcard_list: list of carddav_object.CarddavObject
    :param parsable: machine readable output: columns devided by tabulator (\t)
    :type parsable: bool
    :returns: None
    :rtype: None

    """
    all_phone_numbers_list = []
    matching_phone_number_list = []
    for vcard in vcard_list:
        for type, number_list in sorted(vcard.get_phone_numbers().items(),
                                        key=lambda k: k[0].lower()):
            for number in sorted(number_list):
                if config.display_by_name() == "first_name":
                    name = vcard.get_first_name_last_name()
                else:
                    name = vcard.get_last_name_first_name()
                # create output lines
                line_formatted = "\t".join([name, type, number])
                line_parsable = "\t".join([number, name, type])
                if parsable:
                    # parsable option: start with phone number
                    phone_number_line = line_parsable
                else:
                    # else: start with name
                    phone_number_line = line_formatted
                if re.search(search_terms,
                             "%s\n%s" % (line_formatted, line_parsable),
                             re.IGNORECASE | re.DOTALL):
                    matching_phone_number_list.append(phone_number_line)
                elif len(re.sub("\D", "", search_terms)) >= 3:
                    # The user likely searches for a phone number cause the
                    # search string contains at least three digits.  So we
                    # remove all non-digit chars from the phone number field
                    # and match against that.
                    if re.search(re.sub("\D", "", search_terms),
                                 re.sub("\D", "", number), re.IGNORECASE):
                        matching_phone_number_list.append(phone_number_line)
                # collect all phone numbers in a different list as fallback
                all_phone_numbers_list.append(phone_number_line)
    if matching_phone_number_list:
        if parsable:
            print('\n'.join(matching_phone_number_list))
        else:
            list_phone_numbers(matching_phone_number_list)
    elif all_phone_numbers_list:
        if parsable:
            print('\n'.join(all_phone_numbers_list))
        else:
            list_phone_numbers(all_phone_numbers_list)
    else:
        if not parsable:
            print("Found no phone numbers")
        sys.exit(1)
Print a phone application friendly contact table.

    :param search_terms: used as search term to filter the contacts before
        printing
    :type search_terms: str
    :param vcard_list: the vcards to search for matching entries which should
        be printed
    :type vcard_list: list of carddav_object.CarddavObject
    :param parsable: machine readable output: columns devided by tabulator (\t)
    :type parsable: bool
    :returns: None
    :rtype: None