Grand Theft Auto III (GTA 3) does not have an official release for the PSP (PPSSPP); therefore, any "ISO" found online for Android via PPSSPP is typically a fan-made "mod" GTA: Liberty City Stories
Introduction
" using the PPSSPP emulator on Android. This project ports the characters, missions, and storyline of GTA 3 into the Liberty City Stories engine. Prerequisites gta 3 ppsspp iso highly compressed android
ISO files for this mod are often significantly reduced in size for easier mobile downloading: Grand Theft Auto III (GTA 3) does not