If you are looking for a cohesive "deep story" experience, these fan-made mission packs are the most popular:
environment, the CLEO Mod APK acts as a bridge, enabling mobile players to inject new logic into the game world. This includes: Dynamic Menu Systems gta vice city 1.12 cleo mod apk
No. iOS’s sandboxing prevents CLEO from injecting code. The only way is a jailbroken iPhone, which is highly unstable for GTA Vice City. If you are looking for a cohesive "deep