Hey there
IF the beta rolls out, it will almost certainly be limited to unlocked devices.
If true to form, it would be devices direct from Samsung and a few others but not those from some networks.
If your device is eligible, a banner will appear in the Samsung Members App offering the opportunity to register.
IMPORTANT NOTES
Beta is test software and as such may have numerous bugs. Some elements of your device such as Google Wallet may not work in beta..
Beta isn't for everyone. If software with bugs isn't for you, wait for the stable release.
I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.