Call volume is very low
In the last 3 months, I had a problem with my iPhone call volume in crowded places.
when I'm in a crowded place, call volume on ear is very low but speaker/bluetooth/headset are all good.
I should use headset or speaker when someone calls me!
I restored my phone (without using backup) and problem remains.
iOS 12.1.4 (latest)
Iphone 6
iPhone 6, 12