
iOS 18 is expected to be unveiled during the WWDC keynote on June 10. The first beta should be made available to members of the Apple Developer Program immediately after the presentation. The first public beta of iOS 18 will likely follow in July, and the update should be widely released to all users with a compatible iPhone in September.

The rumored new features for the Messages app with the iOS 18 update include:
RCS Support: This will improve the messaging experience between iPhones and Android devices with features like higher-resolution photos and videos, audio messages, typing indicators, read receipts, Wi-Fi messaging, and improved group chats2.
Per-Word Effects: This feature will allow users to animate individual words within a message, in addition to the existing entire-bubble or full-screen effects.
Suggested Replies: AI-generated suggested replies will be added to the Messages app, analyzing recent messages in a conversation and providing a few suggested replies that users can tap on to send.
Custom Emoji: Users will have the option to send custom emoji that are automatically generated based on the context of recent messages.
Message Recaps: AI-generated recaps of information from several apps, including recent messages received in the Messages app, will be provided.
New Tapback Icons: Tapback icons may be redesigned on iOS 18.

The inclusion of RCS support in iOS 18 will significantly improve messaging between iPhone and Android devices by providing feature parity that has been missing between iMessage and SMS/MMS. With RCS support, users can expect the following enhancements when communicating with Android users:
These improvements will make cross-platform messaging between iPhone and Android devices a more unified and enhanced experience, bridging the gap between iOS and Android messaging.