Apple notes that the encrypted messages are just a test and aren't available for all devices, carriers, or regions yet.

Apple added RCS to the iPhone, but crucially, the current implementation lacks end-to-end encryption. That's changing in the latest beta.

Apple testing RCS Android iPhone encryption in iOS 26.4 Beta 2. Secure cross-platform texting is coming, but not shipping ...

Encrypted RCS will be a game-changer for messaging security ...