What would that look like? Do you mean having Messenger be the default SMS app for your phone, and having it able to receive RCS? If so, these restrictions in A

What would that look like? Do you mean having Messenger be the default SMS app for your phone, and having it able to receive RCS? If so, these restrictions in Android would stop it: https://source.android.com/docs/core/connect/ims-single-registration#security https://source.android.com/docs/core/connect/ims-single-regi... I've been trying to gain some insight on why Google is not making it easy (possible?) to implement a third-party RCS app for Android and was reading about these APIs (clearly intended for OEMs). > This means that third party apps aren't allowed to access RCS single registration APIs as they require carrier certification on the device. Could just be Google passing the buck here, but this does sound like something the carriers would do, if given the chance.