How to send a text message to remind you that you can't receive the call?

Mobile phones don't have this function, but mobile phones have this service, which is called in different regions. Some are called call secretaries, others are called call reminders, that is, when your phone is turned off, you are not in service area or there is no signal, the other party recently called them to remind them that you have done the call reminder service. When you turn on your cell phone or get a signal, I will send you a message saying that a certain number will call you at a certain time. This service seems to be 2-3 yuan a month, and 5 yuan at most. You can call mobile customer service.