Hubby and I have checked all sounds and volumes that we can find. All volumes are up, notifications selected. It just quit sounding a couple of days ago. I had turned the sound off on my camera, thought maybe some sort of connection there. I turned it back on a while ago. My daughter was texting me. It sounded for about 5 texts all of a sudden but then stopped again. Any ideas? I've checked the sounds and vols in settings and under the settings within the app (stock). It still makes the notification sounds for calls. But now that I think about it, it's not been notifying me of twitter updates either. I have email turned off, have since day 1. Don't want that constant sound.