Why does the traffic police force need SMS to verify the electronic driver's license?

The traffic police team wants the SMS verification of the electronic driver's license to verify my identity and the attribution of the certificate. The transportation department has introduced the "electronic driver's license", but at present, it is not universal in all regions, and it needs SMS verification to determine the validity of the holder's identity and the attribution of the certificate. Therefore, it is recommended to carry a driver's license with you in the field. At this stage, the electronic driver's license can not completely replace the original driver's license.