Services like Shadow provide a full Windows PC in the cloud, allowing you to install and play GTA V through a mobile browser or app.
Use the PS Remote Play app to mirror your PS4 or PS5 screen. how-to-download-gta-5-on-android-mobile-hakux-just-game-on
The Xbox app allows you to play games installed on your console remotely. Services like Shadow provide a full Windows PC
If you already own GTA 5 on a console or PC, you can stream it directly to your phone. This gives you the full, high-definition experience without needing a super-powered mobile device. how-to-download-gta-5-on-android-mobile-hakux-just-game-on
If you don't own a console, cloud gaming is your best bet. These services run the game on powerful remote servers and stream the video to your phone.