Saturday, September 27, 2014
I recently purchased an iPhone 6 and immediately noticed the phone call volume through the earpiece was much lower than my iPhone 5.
Speaker volume was more than loud enough, but the low earpiece volume - even though it was at max volume during the phone call - was making it difficult to understand the person on the other end.
A quick Google search for iphone 6 earpiece low volume brings up similar issues.
As mentioned by Ledsteplin on the iMore forums, a possible fix is to go to Settings > General > Accessibility > Hearing Aids and toggle Hearing Aid Mode to On. After I did this and proceeded to make a phone call, the volume was only at half even though I remember setting the volume to max during the previous call. I increased the volume to max and noticed a significant difference.
I also noticed when you toggle Hearing Aid Mode to On you can no longer toggle Phone Noise Cancellation to On (which is set to On by default in iOS 8). I have a feeling the Phone Noise Cancellation setting is the actual culprit, and the real fix is to simply toggle it Off, make a phone call, and set your phone call volume to max.