For approximately the past 3 months my phone makes a "ding dong" noise everyday at 7am and 5pm. I have searched google and not found a solution. My phone's default notification is not a doorbell noise. In fact, I have never set any app to make that sound and had never heard it from my phone until it started up on its own. I do have an alarm clock app installed but it's not set for either of those times, nor does it use a doorbell noise for its alarms. I've also had the alarm clock installed long before the issue started. When the doorbell goes off there is nothing in the notification area so I really don't know what is causing it. I read that Yahoo mail can be a cause of this, but I don't use Yahoo mail and have not installed any Yahoo mail app. My phone is a Samsung Galaxy S 4. Android version 5.0.1. I am not a beginner when it comes to tech stuff, and I have checked everything I can think of in my phone settings, but this has stumped me and is driving me nuts. If anyone has any ideas they would be most welcome. Thanks.