Why is there no sound when I get a call or txt on my iphone 5?

I only got my new iphone 5 yesterday and it was working fine up until this morning. The sound and notifications are all turned on but it is only vibrating when a call or txt comes in.
When I go into sounds and check the volume, there's no problem and it works fine. I set the tones I want and turn the volume up, but its still not working.
Is there a problem with this phone or am I missing something?

Not sure but it seems like every bodies iPhone 5 's are having annoying problems…

There's a switch on the side of the phone right above the volume buttons flip it that should cure your problem

Apple seems to have a lot of problems recently with their products. Try contacting their customer support.

Sent from my Samsung Galaxy SIII

All iPhone's have a Silent Switch on the side of the device, and when the switch is in the silent position, the phone will only vibrate for notifications, calls and texts, and no sound will come through. The switch is located about the volume buttons.