Q: Iphone 6 voice doesn't work when making/answering regular calls

Hi,

I have an issue with my Iphone 6 - whenever I make a call or answer the phone, the other side can barely hear me.

For some reason I don't have this problem when using Voice Over IP (Skype or Whatsapp) so I don't believe it's a microphone issue.

Can someone help me fix this?

Thanks,

ASI