Unicom's mobile phone is turned off, and someone calls. What are the tips?

Unicom's mobile phone is turned off normally, and when someone calls, there will be a prompt that "the number you dialed has been turned off".

If the mobile phone has a similar call reminder service, when someone calls, there will be a corresponding call reminder, informing the other party that the call will be notified to the owner in the form of a short message, and the owner will receive a missed message reminder when opening the mobile phone.