What does the mobile service message mean?

SMS refers to service reminders, notices or promotional information sent to users by mobile phone operators (such as China Mobile, China Unicom and Telecom) through SMS or other means. These messages can cover various contents, such as bill reminder, package upgrade, traffic usage, marketing activities, etc. Mobile service messages are designed to provide timely information and convenient services, but sometimes they are considered as interference or spam by users. Mobile service is a service form providing mobile communication services, which is realized through mobile communication networks (such as 2G, 3G, 4G, 5G, etc.). ).