If you want to play the real Euro Truck Simulator 2, your best options are:

If you want the ETS2 experience on your phone without the risk of downloading suspicious ISO files, consider these legitimate options:

Euro Truck Simulator 2 (ETS2) was for the PlayStation Portable (PSP) or the PPSSPP emulator. The game is officially developed by SCS Software for PC (Windows, macOS, and Linux).