I'm on Spark, my  plan doesn't include the satellite coverage, but the options are all still there for me. I updated my S25U thursday evening and everything has been generally fine. None of the new features particularly apply to my use-case but it seems pretty "swish" overall in general.

It does seem they've prioritised One UI 8.5 over the May security update as  my Samsung A54 which is still on One UI 8.0, just got the May 2026 security update today.

I assume the S25 will get it later this month. I'm certainly being overly pedantic but it feels like in 2026 it should be easy to bundle the latest security updates in as they rollout One UI updates. I guess its just a quirk of how Android works and what Samsung have confidence in testing / pushing out.