iPhone 4 Sound Not Working?

Sup guys. I got an iPhone 4 (AT&T) yesterday and after about 3 hours of use the sound stopped working. The speakers work if I'm listening to music, and I'm pretty sure the vibrate works, but no other sounds are working. If I plug in the headphones, same issue. My current settings under Settings --> Sounds are:

-Silent Vibrate: OFF
-Ringers and Alerts: Button in middle, change with buttons: OFF
-Vibrate: OFF
-Ringtone: Sonar
-Text Tone: Glass
And then everything else is ON.

What's wrong/going on? Thanks

QuarterSwede said:

Did you try a reboot?

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No - what is the best way to go about that? I know I'm a noob - This is my 2nd day with this phone ahha.

QuarterSwede said:

Hold sleep until the "slide to power off" slider comes up.

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Oh - yeah I do that to turn my iPhone off (should I just leave it on sleep 24/7)?

I've done that I think twice so far.

QuarterSwede said:

Yes, it's made to be left in sleep most of the time. If it's actually off you can't receive any calls, texts, email, etc.

If you've already revolted it and you're still having a problem I'm not sure what's causing it. Sound doesn't work in any apps bit the iPod?

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Right - kinda sucks. I have the AppleCare Protection Plan. Should I call them today you think?

QuarterSwede said:

If you live close to an Apple store I'd make a genius bar appointment and have them look at it. It can't hurt.

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Call me an idiot - but I had the "No sounds" switch turned on...

I thought that was the mute switch if you're on the phone though.