Can ipad air receive messages after installing a mobile phone card?

You can use the SIM card number to receive short messages.

The setting operation is:

Step 1: Click the "Settings" icon on the desktop.

Step 2: Open "imessage":

Step 3: Enter your Apple account and click the "Login" option.

Step 4: After system verification, it shows that iMessage has been activated and turned on:

Step 5: Click the "imessage" icon on the desktop.

Step 6: Click the blue plus icon in the upper right corner to open the address book on the iPad, and select the contact person to send iMesaage: