For those of you with a carrier who supports this, are any of you able to get it to work? The option to enable this simply doesn't show up (Messages->Settings->Advanced->Enhanced chat features)
This feature wasn't originally supported on dual sim phones such as the Mate 20 Pro, but according to this
article which mentions a user in my country using the same provider as me, allegedly has it working.
I asked my provider about this, but the support guy I talked to didn't seem very informed and couldn't tell me for sure, so I'd like to ask other users here if it works for you.