With iOS 18, Apple added Rich Communication Services (RCS) support to the iPhone. This allows iPhone and Android users, at least those Android users using a messaging app that supports RCS, to share higher-quality images, receive read receipts, see typing indicators, and send larger files. The only RCS feature that iPhone users can't count on when using RCS is end-to-end encryption. That's because the version of RCS that Apple chose to support does not include full encryption.