To play the actual OMSI 2 on an Android device, you must use or remote desktop services. This requires owning the game on Steam and having it installed on a PC:

: Allows you to stream the game from your PC to your phone over Wi-Fi.

The game’s engine is built on a complex world coordinate system and a script engine designed for high-end PC performance. Translating its 2013-era Windows architecture to mobile processors is technically challenging. Most "OMSI 2 Android" downloads found online are often fake files, malware, or clones that do not feature the official Spandau map or MAN double-decker buses. How to Play OMSI 2 on Mobile (Legally)

If you want a realistic bus simulator on Android, there are excellent official games available on the Google Play Store that are safe, optimized, and worth your time:

I understand you're looking for (OMSI Bus Simulator) on Android. However, I need to give you an important heads-up: