Today a new software update has finally become available for the Samsung Galaxy S9 and S9+ in the US, namely the unlocked units. “Finally” because these models have been ignored by the company in this respect up until now. This is the first update they’ve ever received, and they were launched three months ago.
So despite no official acknowledgement of the matter, it definitely seems like the unlocked units in the US are on a trimestrial security patch frequency. Hopefully this will change in the future, but don’t hold your breath. The carrier-specific models do get more love.
Anyway, the new update is build G960U1UES2ARF4 for the S9, and G965U1UES2ARF4 for the S9+. It’s a 696MB download, and will up your security patch level to June 1, 2018. Once you install this you’ll have the honor of being up to date, security-wise, until the end of the week.
That is, of course, if you’re lucky enough to get the notification among the first. The update is likely to be rolling out in phases. That said, if you’re impatient you can try manually checking for it through Settings, maybe that will help.