Phone and text messages: Apple opens up core iPhone functions in the EU
www.heise.de
RCS/SMS messages and telephony have always only been available in Apple's Phone and Messages app. That will change soon.

Signal for android was never able to do this, and eventually they removed sms.

But this new entitlement, only available in the EU, lets an iOS app of the user’s choice take on all handling of carrier messaging features, including e2ee RCS