'Access the phone_numbers
:returns: twilio.rest.messaging.v1.service.phone_number.PhoneNumberList
:rtype: twilio.rest.messaging.v1.service.phone_number.PhoneNumberList'

@property
def phone_numbers(self):

    if (self._phone_numbers is None):
        self._phone_numbers = PhoneNumberList(self._version, service_sid=self._solution['sid'])
    return self._phone_numbers
