iOS 26.4 beta adds support for testing end-to-end encrypted RCS messaging

Apple added RCS support to iPhone with iOS 18.1, enabling richer cross-platform messaging between iPhone and Android users. This ...
Macworld

iOS 26.3.1 update in testing as new Apple releases loom

Macworld reports that Apple is testing iOS 26.3.1 without a beta cycle, with the update expected within one to two weeks.

RCS encryption surfaces in iOS 26.4 developer beta, but testing is extremely limited

Apple has taken a small step toward securing cross-platform messaging, with early RCS encryption support now appearing in the iOS 26.4 beta. Just don't expect to get that much testing done right now.
Macworld

iOS 26.4 beta 2 is out now, expanding RCS encryption testing

Update February 23: The second beta of iOS 26.4 is out now for developers. It expands the testing environment for RCS encryption to include iPhone-to-Android messages.