No sound from my new iphone 5?

Just bought myself an iphone 5. I can't get it to ring. When someone calls me on Skype, it shows that it is ringing but I can't hear the ring. Furthermore, all alert sound for incoming mail and sms are quiet.

Try this;
Go to settings,
Sounds,
Make sure that the setting called "Change with Buttons" Is OFF.

Other than that, no clue, sorry! Only have an iPod touch, so it doesn't have silent or vibrate options, maybe something in that area will help?