But there is a standard messaging service and have been for years, it is called SMS. I can send an SMS to any phone, including the non-smart phone a mate uses. i know that a non-smart phone or one that can't cope with RCS should rip out all the rubbish, but sometimes it don't, as my mate would tell me. He has had a few messages via people using RCS that his phone will not accept.
Also, how long will it be before we get companies using RCS to send advertisements to us? I get SMS from my bank and my mobile phone company and a couple of other companies I use. Being SMS it is just text, if they start using RCS, i would all sort of rubbish sent.
No thank you, I will stay with SMS, it does what it says on the tin.