U.S version of the unlocked Samsung Galaxy S9 has received its first update since the phone is launched in US. Currently the update brings the latest June 2018 Android security patch to the device along with the multiple bug fixes and stability improvements. Update weighs around 696MB in size and carries the software version number G960U1UES2ARF4.
Samsung Galaxy S9 units on Verizon and T-Mobile received the same update. Update has been rolled out in phases and it will take another couple of days to hit all the devices across the region. Update can be manually verified by heading to settings-> System update.