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When can we have a non-Google RCS app on Android?

We already have a some sort of prototype.

Oh, that's a good start. Thanks! Though from what I've heard, Google won't allow replacing the RCS app like you can with SMS/MMS. Which would significantly limit its usefulness, unless that changes.

The main problem with replacing the stock RCS app is that USIM authentication requires system privilege: https://github.com/Hirohumi/RustyRcs/issues/1

If one's RCS hub doesn't have that as a hard requirement, there shouldn't be any technical reason preventing a third-party RCS app.

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