Well but Hello, everyone!
Thank you very much for your information.
I've been around long enough to know that a daily channel (i.e., dragon channel) exists in the versions, but I don't want it on my daily driver.
I can wait for the RC or stable channel, even though my attempt on the Samsung Galaxy S9 with E-OS failed.
I found the following post in the E-OS forum:
These international Samsungs don’t get VoLTE with any U.S. network, due to:
their internal hardware which is different from North America Samsungs and identifies as incompatible, i.e. non-certified for a particular U.S. network’s VoLTE; their exact model number + suffix is also different from the North American variant.
Samsung’s proprietary IMS/VoLTE implementation which no custom ROM can integrate (or so I’ve read).
Even U.S. variants of Samsung apparently can’t get VoLTE once a custom ROM is installed (unless something changes). Other OEMs don’t have this problem.
Any carrier can tell if a phone has or has not been certified by the OEM specifically to carry Voice over LTE on their network, just by the IMEI, which is visible to their systems; if not, then they will disallow it in countries like the U.S., where VoLTE is now a hard requirement. It would probably introduce a legal liability (inability to call emergency services) to them if they allowed a non-compatible phone on the network once all the 3G is shut down, and eventually 2G.
If a particular device has been tested and certified to use a particular network’s VoLTE, then a setting such as “Enable voice over LTE” or “Enable 4G calling” or “Use VoLTE,” etc., will appear in the menu when that network’s SIM is inserted. (Not to be confused with LTE data, which is not specifically referring to making phone calls.)
Greetings
Mario