Japanese 3G mobile owners can now pay with their phones instead of their wallets with a new service launched by wireless mobile network NTT DoCoMo.
The Felica system lets those with compatible mobile handsets get cash and carry out other secure credit card-based transactions using a 3G network.
http://news.bbc.co.uk/1/hi/technology/3551070.stm
Panasonic's P506iC makes a tinkle noise when it pays for coffee
(note the amusing little 'petite plaisanterie' caption at the end)
