code: def sms_recipients(self):
          
          sms_recipients = []
          UserProfile = django_apps.get_model("edc_auth.UserProfile")
          for user_profile in UserProfile.objects.filter(
              user__is_active=True, user__is_staff=True
          ):
              try:
                  user_profile.sms_notifications.get(name=self.name)
              except ObjectDoesNotExist:
                  pass
              else:
                  if user_profile.mobile:
                      sms_recipients.append(user_profile.mobile)
          return sms_recipients
docs: Returns a list of recipients subscribed to receive SMS's
          for this "notifications" class.
  
          See also: edc_auth.UserProfile.