IPhone 5 help no sound on game apps

I just got the iphone 5 for sprint about a week ago and I Can't hear any sound on game apps while playing them… I even turned up the volume to max but still no sound. Any ideas of how to fix it?

There's a little switch just above the the volume buttons. If it's one way - no sound, if it's the other way you get sound.

I still have no sound on my apps

There's a dash just above the home button on the lower middle of the "slide to unlock" screen. Slide the dash up, and you will see some controls. Just above the airdrop icon, you'll see a volume control. Music might start playing when you raise the volume, if it does, you can pause the music.