What is the expiration date for downloading SMS?

SMS has no fixed validity period. China Mobile's SMS will not expire when it is received. The mobile SMS will be stored in the system for 48 hours. If the mobile phone is turned off or out of service, the system will keep the SMS for 48 hours. If it is turned on or receives a mobile signal within 48 hours, the system will push the SMS to the mobile phone. If it exceeds 48 hours, it will be overdue and cannot be received, and the SMS cannot be retrieved. In addition, the SMS fee will be deducted only when the mobile phone receives the SMS, and the SMS that has not been received for more than 48 hours will not be deducted.