Basic design: a brick in your pocket with a giant battery, all the RAM, CPU, and storage. A Bluetooth earbud with also a giant battery (must last a day always on).
Use cases: Leverage all the voice-activated functions of current chat bots.
User merely speaks all commands, text messages, calendar events, etc.
Bluetooth keyboard and Wi-Fi screen pairing, when you gotta type to configure or install.
End result: A smart device that never dies (if charged daily) and JUST WORKS. Talk to ‘yourself’ and let the system click icons and type on a tiny screen.