We get a handle on the prototype UI inside DoCoMo's imaginary train right after the break.

ENGADGET: NTT DoCoMo Grip UI detects how you hold your device, makes big phones friendly for tiny hands (video)

Gesture UI is a combination hardware-software prototype that the Japanese carrier is showing at this year's CEATEC showcase in Japan.

ENGADGET: NTT DoCoMo Grip UI detects how you hold your device, makes big phones friendly for tiny hands (video)