Hilariously, I had one of my friends on AT&T enable "advanced messaging" so we could exchange videos of quality greater than 640x480p. It didn't work. Turns out AT&T limits this to other AT&T customers only [^1].
The telco companies cannot be more pathetic. AT&T still charges and still counts one RCS message as one MMS/SMS, on top of the standard data rate. Why is something like this, which relies completely on data, is still a technically limited resource? I guess if they could count emails, they would count emails sent and received too. The whole reason why we have this clusterfuck of competing yet non-standard and non-interop messaging solutions is because of their greed.
So, do you estimate that RCS 2 / Advanced messaging will surpass OTT apps or will it become another failure just like SMSes?