Samsung promises to enable FM radio for unlocked Galaxy S9 and S9+ in the US soon
Many customers who purchased the unlocked Galaxy S9/S9+ in the US aren't able to access FM Radio on their devices, even though they should have it enabled.
Upon further investigation, it looks like the fault lies with Samsung, as the South Korean company forgot to add a certain API to the unlocked versions of its new flagships. If you're running a carrier-bound Galaxy S9/S9+ though, you shouldn't have any issues using FM Radio, as they're all on the list of devices that support this feature.
The folks over at NextRadio confirmed Samsung is already readying an update to enable FM Radio on both unlocked phones: