Users who meet the requirements of port number transfer will be issued by the SMS service platform of the current operator (Telecom 1000 1, Mobile 10086, Unicom 100 10) after sending the SMS. The validity period of the authorization code is 1 hour. If the network is not transferred within the validity period, the authorization code will automatically become invalid, and the user does not need to cancel any operation. Users can reapply for the authorization code within the validity period or after the expiration. It needs to be handled through the business hall.