What happened when someone called and nothing happened?

Calling someone to remind you that you have notified the call reminder by SMS means that the other party has started the call reminder service, and the user is in an undisturbed state or turned off when dialing the number, and then the call information will be notified to the owner by SMS.

Call SMS reminder service is a value-added service launched by operators. When the user turns off or does not disturb, the incoming call information will be sent to the user by SMS when the user turns on the phone, reminding the user that there was an incoming call at those numbers at that time.