Does China Unicom have any incoming call reminders?

There is a power-on reminder service: Power-on reminder service introduction: When you call your family or friends, the other party’s phone cannot be connected because it is turned off or is not in the service area. When the other party’s phone within 48 hours After you turn on the phone or enter the service area, your phone will receive a notification text message that the other party's phone is turned on, a reminder text message.