How can Unicom check missed calls when the phone is turned off or there is no signal?

If you need to inquire about the missed calls when the mobile phone is turned off or out of service area, you need to handle Unicom's incoming message treasure or Unicom's secretary's related missed call reminder function on the mobile phone card before it can be realized;

If you need to handle it, you can handle it through Unicom's online business hall and mobile phone business hall or call local customer service for manual consultation.