Galaxy S5 ear piece not working in phone app

[Ajhemm]

Hi,

My Galaxy S5 ear piece speaker has stopped working when making or taking phone calls.

I know the speaker works because when I use whattsapp to make calls it works fine. I can go from putting in earphones to loud speaker then back to the small earpiece speaker if I want in whattsapp.

I have factory rest the phone and I have downgraded from Marshmallow to Lollipop and back again. With no success.

Any ideas?
Thanks in advance

 

[B. Diddy]

Welcome to Android Central! When you make a regular call, does it work with speakerphone, or with wired/Bluetooth headphones?

Does this persist in Safe Mode? https://support.t-mobile.com/docs/DOC-10696