If you have GTA V on your Steam library (PC), download the Steam Link app. It streams the game from your gaming PC to your phone over your local network. This requires your PC to remain on and running the game.
Yes! While you cannot install an APK for the offline story mode, you can play GTA V on your Android or iOS device using two official, legal methods. If you truly want "GTA 5 Mobile," these are the only safe routes. GTA 5 Mobile 3.09 APK
If you own a console copy of GTA V, you can stream it to your phone. If you have GTA V on your Steam