Google Messages introduces device pairing that eliminates the need for scanning QR codes. Users can now connect their accounts on PCs without the hassle of QR code scanning. The process involves signing in to the Google Account from other devices. To set up device pairing, users can open the Messages app and follow the prompts. They can also pair laptops, tablets, or other phones using the same account. Additionally, users have the option to use the traditional QR code method for linking the app.