What's the difference between a call reminder and a short message call?

Call reminder (original SMS call) When the mobile phone is turned off or disconnected (basement or elevator), the call reminder is transferred to the voice system to record the call number. After the phone is turned on, when the phone returns to normal, the incoming call information will be sent to your phone by SMS. At the same time, the destination of the call is displayed in the reminder message, and the message port information is the call number, which is convenient for you to call back directly. In addition, you can set four personalized ringtones, including meeting, flying, driving and rest. Calling by SMS means that your mobile phone is turned off or turned off. Yes, the calling number will be reserved for you. When you turn on your phone or your mobile phone returns to normal, the system will send the other party's number to your mobile phone in the form of information, so that you can know who called you. ! There is not much difference between the two. The two services use a main number and different service codes, that is, the number of SMS downlink is different, and SMS call and incoming call reminder are mutually exclusive.