GTA V on mobile isn't possible now. Actually, there probably are tablets and STBs powerful enough to play a base level of the game now, but that doesn't make a release plausible. It has to be playable across a wide variety of hardware at decent quality. In ten years your mobile phone should be as powerful as a last generation gaming console.
In 2015 Rockstar remastered the graphics in GTA San Andreas, and converted the controls to make sense on a touch screen. It's a mobile app now. GTA:SA originally came out in 2004. So, 11 years for a dedicated console game to be playable on a wide assortment of mobiles.
GTA V came out in 2013, for the XB360 and PS3. The 2015 version for XB1/PS4 is really definitive. Maybe in 2026 GTA V will be playable on mobile.
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