code: public void setMobileCarrierSegment(com.google.api.ads.admanager.axis.v201902.MobileCarrierTargeting mobileCarrierSegment) {
          this.mobileCarrierSegment = mobileCarrierSegment;
      }
docs: Sets the mobileCarrierSegment value for this ProductSegmentation.
  
  @param mobileCarrierSegment   * The mobile carrier segmentation. {@link MobileCarrierTargeting#isTargeted}
  must be {@code
  true}.
  
  <p>This attribute is optional.