don’t hear call volume in iOS 9, for Incoming calling volume is one of the most hesitating problems in iOS device. Many users are frustrated on low calling volume then aspect. That time you can fix through from this tutorial guide. Mostly iOS 9 Users querying, after iOS 8 update with iOS 9 and installing device result poor calling voice quality, and dead sound.
Devices mostly affected with Poor call volumes are iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6S Plus. If you are getting this problem on any other iOS devices, than share with us about full story in detailed on below comment box.
Try to fix: Don’t hear call volume in iOS 9, running on iPhone
1st : Go to the Setting > Sounds > Enabled change with button. When you receive incoming call then press volume up button from side edge. That will affect incoming voice quality.
Enable Phone noise cancellation under the setting