What is Unicom's incoming short message treasure?

According to what you said, it should refer to Unicom's "Ruyi Call" service, that is to say, when the user who has opened Ruyi Call is in the state of "off or out of service area", the incoming call will be transferred to Ruyi Call System Platform. When the called user turns on the phone or returns to the service area, he will inform the missed call information by SMS in time.