What short message can Unicom send to check missed calls?

Unicom users can't query missed calls by sending short messages. In order to prevent missed calls, Unicom secretary service can be opened. Unicom mobile phone users who have applied for this service, when their mobile phones are turned off, busy or out of service area, incoming calls will be automatically transferred to the voice platform of "Unicom Little Secretary". Calling users can choose to leave a message or hang up directly according to the voice prompts of the system, and the system will send messages or incoming phone numbers and time to users' mobile phones in an accurate and timely manner by SMS, so that you will not miss any incoming calls.