Gemini Notebooks are now available on mobile without a paywall, allowing users to organize chats and files in a centralized project hub. Existing NotebookLM notebooks sync to mobile, enabling direct saving of chats as sources. The feature is accessible to both free and paid users, with source limits varying by subscription plan: free users can add 50 sources, AI Plus users 100, Pro users 300, and Ultra users 600. The rollout is live for most users globally, with updates expected in Europe and other countries soon.