Samsung mentioned that they were bringing back FM radio support with the Galaxy S9, which is a feature that’s typically present-but-disabled in Samsung flagships. Samsung’s not the only guilty party, either, but it’s meant that most high end phones have foregone local radio support in the last few years.
That’s all changing with the Galaxy S9 and Galaxy S9+, but not without some hiccups. The carrier locked versions of the phones in the US do have a functional FM radio, but the unlocked version (which is the one you should be buying if you’re paying attention) somehow managed to ship without it enabled. It wasn’t on purpose, though; Samsung has clarified that it was an accident due to a software bug, and some users have confirmed that by flashing carrier firmware onto the unlocked model to check if it works.
Samsung is working on a software update to re-enable the feature, although there’s no timeline for exactly when that will be available. There’s no carrier interference with those updates, but that hasn’t actually sped up software updates on some of their other unlocked phones.
source: XDA Developers