From the whitepaper it still seems to use RCS for the transport, just encrypting it and using a special mime type. I know that carriers have various RCS apps, b

From the whitepaper it still seems to use RCS for the transport, just encrypting it and using a special mime type. I know that carriers have various RCS apps, but they likely have special access. Cross-carrier apps like Signal would require OS support for RCS APIs. IIRC there are plans to add such APIs to Android. I've found old threads [0] that it may be included into Android 11 but nothing in the official docs [1]. So maybe it'll be added to Android 12? [0]: https://www.reddit.com/r/UniversalProfile/comments/g6r4av/android_11r_developer_preview_4_today_rcs_apis/ https://www.reddit.com/r/UniversalProfile/comments/g6r4av/an... [1]: https://developer.android.com/about/versions/11/features https://developer.android.com/about/versions/11/features