'Add a <Sms> element
:param body: body of message
:param to: to phone number
:param from_: from phone number
:param method: action URL method
:param action: action URL
:param status_callback: status callback URL
:param kwargs: additional attributes
:return: <Response> element'

def sms(self, body, to=None, from_=None, method=None, action=None, status_callback=None, **kwargs):

    return self.nest(Sms(body, to=to, from_=from_, method=method, action=action, status_callback=status_callback, **kwargs))
