What does China Mobile mean by charging a service fee?

This sentence refers to the money charged by mobile companies for other value-added services such as third-party data services.

The collection service fee of China Mobile is usually generated by the cooperation between the mobile company and the third-party service provider (SP manufacturer) to provide specific services for users. These services include short message service, voice call, data stream and value-added services. According to the agreement with SP, the mobile company will collect fees and transfer them to SP.