Being this string never completely answered the question, and i was wondering if it had a unlocked FM tuner as well.
As mentioned earlier you need an app, so i downloaded and installed NextRadio app to test it. With headphones plugged in, i launched the app, went into the menu and selected "basic tuner" and was presented with a tuner bar, selected a local station (that does not offer streaming) and was listening to FM radio.
The reasons i love this option is in case of an emergency and cell towers go down or are over burdened, this will give me a way to listen to the radio for news and announcements. Plus it is a nice option to have the rest of the time.
For reference
Galaxy S9+
US
T-Mobile
Bought outright (not sure if that would make a difference, but would not surprise me)