My iphone 4s, which I have had since last June, does not show me when I'm getting a text. Not only does it not ring, but it does not have any means of telling me I'm receiving a text. My settings are all good, I have checked many times. Do not disturb is off, it is usually on vibrate, but my settings for texts on vibrate are NOT on silent. The only time I see that I'm getting a text is when I unlock the phone and go to the conversation to see that person had replied. I'm missing very important texts so I would love to figure this out! I have iOS 6, I have deleted all of my messages to see if that helped, and I don't think any of my settings are oddly set.