The basic testing which i am assuming in mobile applications are:
1. Check compatibility of the mobile application by installing in different mobiles.
2. If it is game, you have to play the game in different mobile devices to check for the bugs. Bugs include like proper graphics, speed of the game, smoothness of the games etc. Simulators will be there to play the game. You have to do a complete functional testing like Contorls are working properly or not.
3. In case of application, the same functionality testing will be there. If the app is connecting to internet and gets data, you have to check whether it is getting the right data or not.