Does it constitute infringement for operators to send free short messages? Can users request it?

Telecom's C China SMS is valid for 2 days. Due to the domestic restrictions of China Mobile, those sent to China Mobile can only be kept for 24 hours. Telecom's "SMS storage" service is a comprehensive service that both the calling party and the called party can subscribe to, and it is only applicable to Tianyi mobile phone users of China Telecom. After subscribing to this service, the SMS sent/received by users will be automatically saved in the SMS safe deposit box of users. Users can query SMS records of safe deposit boxes through self-service China Station. When the safe deposit box reaches 80% of the set capacity, it will receive an automatic notice from the system. Short message storage service provides point-to-point, point-to-point application and point-to-point message storage service. Please refer to the above contents. Unicom's SMS storage suggestion can be confirmed by Unicom customer service.