This is an official assistant app that works alongside the PC version of the game to show you schedules and ticket info—but it is not the game itself.
If you are looking for a realistic bus simulation experience on your phone, there are highly-rated alternatives available on the Google Play Store : Bus Simulator: Ultimate Omsi Bus Simulator 2 Free Download Android -NEW
The latest "NEW" update of the OMSI 2 Android port has redefined mobile simulation. Here is what you get when you find the correct file: This is an official assistant app that works