How does Apple's mobile phone send and receive short messages on the computer?

In "How to contact you through iMessage", at least check your mobile phone number and the email address used by Apple ID. Generally speaking, the mobile phone number is checked by default, and there is no need to make a choice.

2. To use the continuous intercommunication function of ordinary short messages on the Mac, first click the magnifying glass in the upper right corner of the Mac screen, enter "information" in the search box, and then double-click the "information" item in the list:

1. After opening Messages, click Messages in the upper left corner of the screen, and then continue to click Preferences ... to confirm that the Apple ID matches the Apple ID sent and received on the iPhone. If not, please select logout;

2. then log in to the Apple ID used in iPhone "send and receive". Then confirm that Enable this account is selected.

3. Finally, select at least your mobile phone number and the email address used by Apple ID in "Your information receiving address:".

3. Finally, go back to your iPhone and enter Settings-Messages-SMS Forwarding. The devices with the same iMessage function as the Apple ID of this iPhone will be listed below. You can choose to turn on the SMS forwarding function of the specified device. If the setting is successful, a confirmation message will be displayed on the iPhone.