If there’s no any sound in the game, try the following: 
1.Check the game settings to make sure sounds and music are turned on 
2.Restart the game app 
3.Restart your device 

That usually fixes the problem.If the sound is still missing, try the following: 
1.Make sure your device is not muted and that the volume is high enough 
2.Try plugging in and unplugging your earphones 
3.Make sure your music player is turned off 

If none of that worked, open another application to make sure the sound is working. If the problem hasn’t been gone. there’s probably something wrong your device not the game.