No, GTA 4 for Android does not exist. Searching on the internet you could run into deceptive sites, which offer the possibility to play on mobile by downloading a file, complete with instructions. Be careful, we would like to say it, because these are fake apps that could put your device at risk: some are imitations of the game, others could turn out to be real viruses.
The most recent chapters of GTA PCs and consoles remain exclusive, but if you want to play from a smartphone there is a solution: try one of those available for Android! In fact, over the years Rockstar has also covered the mobile gaming sector, publishing the following GTAs for mobile:
Grand Theft Auto III: the first chapter of the series in 3D graphics, released in 2001 and available for Android smartphone and tablet at a cost of € 4.99 GTA Vice City: originally launched in 2002, one of the most acclaimed of the series thanks to the 80s setting. Available on Android for € 4.99 GTA San Andreas: another very successful chapter, available on Android for € 6.99 GTA Chinatown Wars: originally intended for portable consoles, with top view and minimal graphics. It costs € 4.99 GTA Liberty City Stories: the prequel to GTA 3, set three years earlier. It was originally launched in 2005 on consoles and is now available for Android for € 6.99. With this we hope to have clarified the GTAs available for Android. We repeat, do not be tempted by misleading advertising and avoid downloading files that do not convince you. Rather, it looks like there may be some hope of reliving Niko Bellic's adventures on PS5.