On June 2, 2026, OpenAI live-demoed a "Agentic OS" prototype built for phones at a Voice Hack Night event. No apps are installed on the phone, and there is no app store — all interactive interfaces are "generated in real time on demand" by an on-device local model, with complex reasoning tasks seamlessly handed off to cloud GPT for processing. The developer performed no touches throughout, completing operations like booking flights, deleting calendar entries, looking up AI news, sending emails, and listing to-dos entirely through voice commands. The core design philosophy is summed up as "UI is the OS." In traditional phones, users enter fixed interfaces by tapping preset apps; in an Agentic OS, the interface is a temporary output of the AI, rendered in real time with every interaction. The prototype of this path comes from supply-chain reports published by well-known Apple analyst Kuo Ming-Chi on April 27, 2026: OpenAI is co-developing phone chips with MediaTek and Qualcomm, exclusively manufactured by Luxshare (立讯), running an Agentic OS built from scratch, with the goal of mass production in the first half of 2027. OpenAI CEO Sam Altman has hinted at the project multiple times in public, and said directly: "Now is the right time to seriously rethink operating system and user interface design." If Agentic OS can really take apps off the main entry point, the three-stage "icon-launch-page" pattern of mobile apps will become history, and App Store's moat will also be bypassed. Mobile-app developers, product managers, and UI designers need to rethink their professional position — in a world of "task as entry," tools are no longer "opened," but "summoned."