All of our games have a mute button that can be found in the main menu, within the settings, or some place on the home screen. If you cannot hear your sound, please be sure that the sound is not switched off.
After you've verified the in game mute button is not activated, the next place to look are at the hardware buttons on your device. The volume and device mute button are located on the side of your device. If your device is muted, the orange will be showing when the button is toggled.
If you are still experiencing issues, we suggest restarting your device then follow the steps provided above.