I know from when my grandfather went through this stuff a few years ago capabilities varied widely. Everything from an electronic “ear tube” that does nothing but make things louder up too much fancier things with digital processing to help you hear voices. It all depended on how much money you had to spend/how good your insurance was. Sounded like it was common for people to get the low-end models and only something for one ear to try and save money.

iPhones cost much less, but many people still can't afford them. Perhaps a publicly provided health care approach would help people in the U.S.