While you cannot install the full game directly on your phone's storage, you can it from a platform where you already own it. How to play GTA 5 on Smartphone and TV? - Shadow PC
Once you've installed and configured the game files, you can launch GTA V on your Android device. The game's controls are optimized for mobile devices, with intuitive touch controls and a user-friendly interface. While you cannot install the full game directly
This violates Rockstar’s EULA. You risk a ban from Rockstar Social Club if you log in. Also, many fake mods contain malware. Only use sources like GTAForums or ModDB . While you cannot install the full game directly
