The two updates will arrive as software version G960USQU3ARG4 for the Galaxy S9 and build G965USQU3ARG4 for the Galaxy S9+. Neither update is huge, but does fix some bugs and include a new security patch.
For bug fixes, these updates fix an inter carrier video call bug, an outgoing call failure bug, and one that caused the phones to reboot when unlocking with the iris scanner. For improvements, voice call quality should be better.
These S9 updates also include the July Android security patch. Yes, we’re already a third of the way into August. As a reminder, Samsung is doing a pretty awful job at keeping the S9 and S9+ up-to-date.
To check for the update, head into Settings>System update.