RCS solves NONE of the problems that need solving, and only gives carriers another thing to charge for. Specifically: * the spec is very very complex, and most parts are optional, so no two phones/carriers/manufacturers/OS versions will ever agree on anything but the basic minimal set of features. * there is no specification for end-to-end encryption, and even if there were, it would be optional (as noted above) * RC…
I’ve found it more reliable to use an email address for sender and recipient, then it avoids the limbo of trying to send, SMS fallback, etc.