The problem is that RCS has completely failed at making even different RCS servers compatible. Carriers like AT&T and Vodafone that were early to adopt RCS nev

The problem is that RCS has completely failed at making even different RCS servers compatible. Carriers like AT&T and Vodafone that were early to adopt RCS never even managed to interoperate with other RCS carriers - you could only send RCS to other AT&T subscribers, or other Vodafone subscribers. Then they all gave up and just adopted Google's servers. So now RCS just means "Google Jibe". It's a failed standard. It never worked.