Lol, this post is over two years old, but it solved my problem. Well, to be more specific, it solved my dad's problem. I'm visiting for Christmas, and he mentioned that his Facebook Messenger app had stopped playing the default notification sound when he would get a message. I'd looked at every single notification setting on his phone, uninstalled and reinstalled the app, but nothing worked. Finally, I googled "samsung galaxy note 9 facebook messenger sound not working" and this thread was the 4th search result. Sure enough, he had the Clean Master app installed on his phone. I uninstalled it and he now has sound with his Facebook Messenger notifications again. Thank you for your suggestion!

I have same issue, given and accepted solution wont solve the actual issue. 

Contact app needs to show the WhatsApp symbol as shown in above image for valid whatsapp phone number. This feature was working great in my old samsung phone.

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i have the galaxy3 and it was doing the same thing!! Drove everyone insane but me because i didn't hear anything! I went into call history log, hit menu, went to call settings, additional settings, and unclicked the Noise Reduction selection and it fixed the issue. hope this helps!

Some of the galaxy phones only allow you to turn off noise reduction on a per call basis. So you may have to do that every time you make a call. Depends on the phone. Are any of you running into this problem?

I tried some of your suggetions but not a single one works.. So i looked at my samsung S4 which has the echo problm... and i noticed that there is some dust in mic hole... i cleared it with a needle and its really works now with no echo for caller or for me ...

Echo should not happen. Sometimes it is a physical problem with the phone. Sometimes it is a bug in the programming of the phone. If you can't resolve it and you wan't out of your contract, write a letter to the FCC. That quickly got me out of mine with T-mobile and 3 phones (all samsung S3) that had echo problems.

Solved echo problem. The battery on my galaxy s5 was slightly swollen, pushing the cover out. If you look at the back cover there is a gasket or seal whichever. The battery pushing out keeps it from sealing. So just get a new battery. 0852c4b9a8

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