How to get my iPhone 5 off of the silent setting?

I have very little experience with smart phones and very recently got an iPhone 5. While the phone shows that the ringer is at full volume, whenever someone calls me the phone will only vibrate. Can somebody walk me through how to fix this?

Settings general sound

There's a small mute switch on the side of the phone. If you see a little red line by the button that means your phone is on silent.

Have you tried the switch in the left side of the iPhone on top of the volume buttons? If it's down then its in silence.switch it up!