What does China Telecom's leak service mean?

It means that when the user's phone is turned off, out of service area, and the phone line is busy, the China Telecom system will automatically send a short message to remind the user of the incoming call information.

Missed message service is a short message reminding service provided by China Telecom for Tianyi mobile phone users who have not opened personal communication assistant service. When the user can't answer the phone, the system will automatically send a short message to remind the user of the incoming call information. In this way, even if the user misses an important call, he can know the information of the incoming call in time so as to make corresponding treatment.