Samsung Galaxy S9 arrived in India just a week after the official announcement at MWC. The flagship duo keeps receiving its monthly updates and the latest one brought dual VoLTE support. The software patch also brings some fixes and performance tweaks.
According to the screenshot we got, the update for the Galaxy S9 is 426 MB in size and its version is G965FXXU1BRE5/G965FOXM1BRE3/G965FXXU1BRE3. It enables usage of VoLTE and VoWiFi over both SIM cards for the devices with dual SIM slots.
If you havent received a notification about the update of your dual-SIM Galaxy S9, head to Settings and then Software Update to enable it. All devices in India should already have it, but since it is a rolling update, you might have to wait a while until it gets to you.
Thanks for the info, Prathamesh Birajdar!