Hi Simmmmo8,
Thank you for using the Apple Support Communities. If we understand correctly, your iPhone is in Silent mode and you're not hearing sound in games or in some other apps. Is that right?
This link covers How to put your iPhone on vibrate, ring, or silent mode. You should still hear some content, like music from the Music app, but some games and other apps will be muted when your device is in Silent mode. While what you're experiencing might be normal, it's worth testing in something like the Music app to make sure you hear audio as expected there, and to make sure your volume is turned up as well.
We hope this answers your question.
Best wishes.