Generative AI: iOS 18 could add generative AI features for the iPhone, improving Siri's capabilities and allowing users to automate complex tasks using just their voice
Smarter Siri: Apple is working on incorporating large language models into Siri, which would let users automate complex tasks
improve how both Siri and the Messages app can field questions and auto-complete sentences
RCS Support: iOS 18 is expected to support the cross-platform messaging standard RCS in the Messages app on the iPhone
improvements to the default messaging experience between iPhones and Android devices