Thank you for your post. There have been multiple updates released for the S9 this year, the latest being released on 5/14. Please keep in mind that only Cricket branded devices will receive updates and that some updates require Wi-Fi to download.
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I have a Samsung S9, Model Number SM-G960U with software RJ6(AIO) (Android Oreo v8.0).
I am on WIFI, checking for updates and keeps saying my phone is up to date.
So when is Android Pie v9.0 rolling out to our phones?