Samsung has kicked off the One UI 2.0 beta program for the Galaxy S9 and Galaxy S9+. The beta is currently available in India and South Korea, where users of either device can sign up for the beta from the Samsung Members app. The Android 10 beta has also been released for the Galaxy Note 9 in India, exactly a week after it was launched in the UK and South Korea.
Once you have enrolled in the beta program via the Samsung Members app, you can grab the first Android 10 beta update by tapping Download and install in the Software update menu of the phone's Settings app. The update ranges from 1800 to 1900 MB in size depending on whether you are using a Galaxy S9 or S9+ (or a Galaxy Note 9). Be sure to backup your data using Samsung Smart Switch before you install the update.