def v2010(self):
        """
        :returns: Version v2010 of api
        :rtype: twilio.rest.api.v2010.V2010
        """
        if self._v2010 is None:
            self._v2010 = V2010(self)
        return self._v2010
:returns: Version v2010 of api
        :rtype: twilio.rest.api.v2010.V2010