We're well into the process of converting the Messaging app included in GrapheneOS into a modern app. We'll be making a new release later today with a completely overhauled user interface written in Android Compose. We've made a massive amount of other improvements and bug fixes beyond that too.
The Mastodon thread linked in the most said they are planning to get an implementation that requires sandboxes Play Services first, then they should have a better idea of how to implement it solely with the carrier. It is an open standard in theory, just not in practice, since it is secretive.
The Mastodon thread linked in the most said they are planning to get an implementation that requires sandboxes Play Services first, then they should have a better idea of how to implement it solely with the carrier. It is an open standard in theory, just not in practice, since it is secretive.