Docomo's answer is to offer a "safety mode" which Android users have the option of activating. Those that choose to use the mode will see a message if they try to use their device while walking. The message reads, "Using your smartphone while walking is dangerous. The phone senses you are walking. Please stop." Tapping "close" on the warning message will give the user an extra 10 seconds of use, while pressing the power button will give the user 5 extra seconds before the device stops working.
The new mode can be set for three different degrees of sensitivity to determine if the user is walking: high, medium or low. The carrier is spending the big bucks to promote this in Japan using a cartoon image of a distracted cellphone user about to get rammed by a bus.
Docomo's Safety Mode stops texting while walking
source: Docomo (untranslated) via TheRegister