Is the temporary adjustment of high-speed rail seats constrained by SMS?

According to relevant information, the temporary adjustment of high-speed rail seats is not restricted by SMS. Because the temporary seat adjustment of high-speed rail has changed, please refer to the seat information, train number information and departure time marked on the passenger ticket. When using 12306 software to purchase tickets, the departure information should be based on the information published in the software. Passengers will not receive the seat adjustment information sent by the railway company. Our trains are standardized, so the seat number will not change. Therefore, the temporary adjustment of high-speed rail seats has changed, and it is not bound by SMS. For specific information, please pay attention to official website for first-hand authoritative information.