IPhone doesn't ring when on loud?

My iPhone I've had for about half a year now, and had zero problems with it. Now, it won't ring. It's on loud and everything. My alarms go off and play the tone, but when people call/text me I get no tone or anything just a vibrate. Anyone know why or had this problem before and fixed it? Thanks guys!

Added (1). I tried the little switch on the side, still nothing.

Try a little switch on the left side of the phone

Don't worry, just do a factory reset of the device and your problem will be solved.

Haha that's Apple, just resale and buy HTC one x+

I think have some seating problem

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