When someone starts yapping away on their spivphone in a train, the best trick is to stop reading, gazing out of the window or whatever, get their eye contact and pretend that you are listening intently to their conversation. The odd nod, raised eyebrow and "Really" "Hmmm" or other comment will soon begin to put them off their yack with Simon in Sales or whoever their crucially important call is with....
Use some manners, spivphone yappers - switch the phone to silent message mode in public transport or make your call from the end of the carriage. Same goes for aeroplanes when this picocell system is installed - hopefully to use it for incoming calls or outgoing calls will require a substantial registration fee and high call charges to minimise disturbance to other passengers.