How to check the contents of SMS and MMS in my computer?

You can see it with the data synchronization software in the small CD that you sent when you bought your mobile phone. I don't know what brand of your mobile phone is. Nokia has PC tools, and domestic mobile phones use Phone suite. Open the software on the computer, connect the mobile phone with the data cable, and select the data port option on the screen. After the connection is successful, you can see SMS and MMS from the menu of PC software, and then save them to your computer.