Some contents support subtitles, some do not. Netflix is one example...not all movies or TV shows support them, at least not yet. To ensure if it's captioned, press and hold the Home button while viewing the movie or show, it will bring up a subtitle menu.
This is why I did Not get it yet... Even amazon doesn't have it yet and it's frustrating for hard of hearing people(like myself). I can hear but I miss many words and lose interest if it's not captioned.
Whoever is hearing impaired will agree.
I will never forget this person who compared blindness w deafness!
Sadly the blind cannot watch TV so that was mean!