This must have come in this week's update. I have a setting in the phone for it. Noticed when my wife's S9 called me we both were prompted to enable. Is this the rcs we have been hearing about?
Any idea what RTT is? It was enabled when I got my Note 9 on release date, but seemed to just be texting while in a phone call. Seems kind of like a lame feature, but perhaps I'm missing something.
I thinking for hearing impaired mainly. If on release I never saw. Yesterday was first time I have ever had a phone call where a message popped up during the call asking if I wanted to enable it.