Many "GTA 5 Mobile" advertisements are designed to trick users into downloading malicious software or completing "human verification" tasks that never lead to the actual game.

Communities like GTA5-Mods.com are widely used by the PC modding community and include safety verification processes.

If you want to play the real GTA V on your phone safely, you must use or cloud gaming services. These allow you to stream the game from a powerful PC or server to your mobile device:

Official mobile hardware is generally not capable of running the full 100+ GB PC/console version of GTA V natively. Legitimate Ways to Play GTA V on Mobile

If you are looking for mods for the of the game, you should use established community platforms rather than APK sites: Script Hook V: The standard tool for running mods in GTA V.

Are you looking to install for the PC version, or are you trying to find a way to play the full game on your phone?

Most apps claiming to be a mobile version of GTA V are scams or fan-made mods of older games, like GTA: San Andreas, redesigned to look like GTA V. Critical Safety Information

Use official apps like Steam Link or PS Remote Play to stream from your own PC or console.