The iPhone does not ring, only vibrates

What phone you have would be useful to know but for

Android : How to Turn off Sound and Vibration in Androids Keyboard

Iphone: If you set the iPhone to vibrate in silent mode, it still makes an audible buzzing sound that may bother or disrupt others. If you need your iPhone to stay completely quiet, temporarily disable vibration. You can turn off vibration when silent mode is on, off or both. Tap the button next to "Vibrate on Ring."

Blackberry:
Turning vibration on my mobile phone on or off

1. Find "Notifications" Slide your finger down the display starting from the top edge of your mobile phone. ...
2. Turn vibration on or off. Tap the indicator next to Vibrate to turn the function on or off.
3. Exit.

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Strange. I would try resetting your iPhone. Hold down the home and power buttons until it powers off. It should start up automatically but if not just press the power button. This has worked for me in the past when my iPhone has acted strangely.
Don't worry about a reset or hard reboot. You won't lose any data or settings.

If you're missing incoming phone calls due to your iPhone not ringing, you may have accidentally switched the ringer to vibrate or silent, according to Apple. The switch on the left side of the iPhone turns off the ringer and usually sets your phone to vibrate mode, but if your iPhone's vibrate setting is also disabled the phone will instead be set to silent mode. When in the phone's sound settings vibrate mode can be enabled, and the ringer volume of your phone is adjustable.

Read more: My iPhone Will Not Ring ' eHow.com http://www.ehow.com/how_7384812_iphone-not-ring.html#ixzz22OJOMZGR

There is a small knob on the left of the iphone. If you can see small tiny red dot there, then your phone is on vibrate mode. Switch that on. Your phone will get back into ringing mode..

Cheers!!
Guru..

hey bro,
i fix more problem like your's. by change the flex up. with volume+vibrat button+headphone.
change this and all your problem will be good.
memeh Fixphone

I would try a system restore, plug your iPhone into iTunes and click restore, it will delete everything but once its done it will restore it to when your last sync was.

Is the volume up fully (click on the volume buttons on the side)

Is it on vibrate? Very easy to inadvertently knock the sound switch to vibrate, which is located next to the volume buttons.

Hope this helps. Let me know if it doesn't.

BReady

I have the same problem! I have done everything, but still only vibrates.

you can actually move the button , on the top left hand side of your iphone, over the ringer volume, you will see a red or orange dot, this means the switch has you iphone in silent mode, I was stuck on this, until I found it is a actual switch, look at it closely, you can move it. So where you see the red dot, put your finger on it and move it the opposite way, and I do not mean press the button, I mean, flip the switch on it, then your phone will not be in silent mode anymore,,, this was very annoying, I hope it helps anyone that has the same problem.
cheers!