iPhone 5S no sound in games

Hey guys so I recently started downloading apps for my iPhone 5S and I have a problem. I bought & downloaded a game you are all familiar with GTA San Andreas.

The problem is I have absolutely no sound for it. Not in the menu, not in the cinematics and not in game.

Anyone know how to fix this? Please help urgently 😀
 
Solution
flip the side ringer/silent switch on the side of the phone. that normally does it for me. If its on ringer flip it to silent the back to ringer, and if its on silent flip it to ringer.


Well the phone doesn't have music on it yet, but I have an app with bird calls and those sounds work fine so the phone does have sound if that is what you wanted to find out with your question
 
Silent ringer thing fixed it thanks

Already have 2 androids, been using android since 2010 :)

Going back to it after this after what happened to the iPhone 6, just testing out new waters. I like the feel, look of the iPhone it just scratches way too easy best answer selected btw.

I didn't even know there was a button for that I just kept increasing, decreasing the volume