Does it mean to get the incremental index of passenger cars by SMS?

Yes Getting the increment index of passenger car by SMS is to shake the license plate. The increment index of cars refers to the index that can only be obtained by lottery or bidding, and usually refers to the number of passenger cars increased on the basis of existing passenger cars, because in big cities, vehicles have been restricted and daily traffic is limited. Incremental indicators refer to those car owners who need license plates to buy a car again when the number of license plates exceeds the limit. Car owners can get new license plates by participating in auctions or sweepstakes.