Cellular and pager services don't have enough capacity to transmit more than small files, such as short messages, at a reasonable speed. More robust services are available in a few large metropolitan areas, but not nationwide. The cost of wireless data service is much higher than telephone or Internet service, making it difficult to justify on a large scale. And security remains an issue. Yet the demand clearly is there, as Microsoft's recent announcement of the Automobile PC suggests.
Experts expect new product and service announcements almost daily.