I have been searching for hours without any luck. Any help would be greatly appreciated! I have an iPhone 4 that suddenly stopped ringing when someone calls. No sounds for incoming texts now. The keyboard clicks and lock sounds do not work suddenly. However, the speaker works when listening to the iPod and when calls are placed on speaker. The phone will also ring calls through the headphones. The volume buttons don't work. I can use the slider in sound settings and the phone will play the ringtone, but the side volume buttons have no effect. The phone will vibrate when the mute switch is on and a call comes in. When the mute switch is off, no ring, no alerts, etc. No idea what happened. Any clues? Thanks in advance. Have tried soft reset that does not work.