How does Unicom mobile phone card receive short messages on the computer without opening the mobile phone?

The computer can't receive short messages.

The computer can't receive SMS: the mobile phone has a GSM module for sending and receiving SMS, and the computer doesn't have a GSM module, so it can't receive SMS.

About: GSM module is a functional module that integrates GSM RF chip, baseband processing chip, memory and power amplifier device on a circuit board, and has independent operating system, GSM RF processing and baseband processing and provides standard interface. GSM module has all the basic functions of sending short messages, voice calls and GPRS data transmission based on GSM network. Simply put, GSM module plus keyboard, display screen and battery is a mobile phone.