Passenger orders a taxi on his phone and watches it through GPS. The taxi arrives. The passengers pairs his phone with the PIM. Passenger selects music on his phone, which is then played via the taxi's sound system.

A couple orders a taxi. They get in and select the Photobooth option on the PIM. The couple takes a round of pictures via the PIM's camera and sends them to their email.

Passenger street hails a cab. He then enters his drop-off information  into the PIM in the back of the cab. The trip information syncs to the DIM. Driver and passenger can now follow the trip progress through their respective devices. 

Passenger uses the integrated Skype feature in the taxi's PIM to talk to his loved ones in real time.