code: public void setMobileDeviceSubmodelSegment(com.google.api.ads.admanager.axis.v201811.MobileDeviceSubmodelTargeting mobileDeviceSubmodelSegment) {
          this.mobileDeviceSubmodelSegment = mobileDeviceSubmodelSegment;
      }
docs: Sets the mobileDeviceSubmodelSegment value for this ProductSegmentation.
  
  @param mobileDeviceSubmodelSegment   * The mobile device submodel segmentation. {@link
  MobileDeviceSubmodelTargeting#excludedMobileDeviceSubmodels}
  must be empty or null.