Low volume while on calls
I have the latest update and I have an iPhone 6. This started last week where I can barely hear the other person while on a call.
The volume is set to the highest setting. Prior to this I would leave it half way up and it was plenty loud.
I reset my phone and did all the updates. Nothing changed. Yes, I removed the plastic piece that covers that part of the phone when I bought it.
Please help. I can only use my phone with an earpiece or on speakerphone.
iPhone 6, iOS 9.2.1