How does China Unicom cancel caller ID and missed call reminder?

Caller ID is a service that can display the calling party's phone number on the phone when the user answers the phone. If you cancel, the phone number of the calling party will not be displayed for any incoming call. The way to cancel caller ID is: 1. Some caller ID can be cancelled by calling the local Unicom customer service hotline, but not all caller ID can be cancelled in this way. 2. Bring the valid ID of the owner to the local Unicom business hall for cancellation.