I have an iPhone 4 running iOS 7 latest version.
Several times a day my phone will fire off the tri-tone sound and I will think I have just received an SMS, but there is nothing, and no alerts in the pull-down notifications. I have been through the list of apps in the notifications. My mail apps are in the Do Not Include section of Settings | Notification Center.
Any ideas?
Best Answer
In the Notification Centre settings, you can have an app only play sounds but not show any notifications, or show anything on the lock screen.
Take a look through the list for entries that only show Sound as the notification options, and turn off the sound option.