A portable radio telephone handset includes the capability of operating as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation are available in the handset, an analog cellular communication mode and a Cellular Digital Packet Data (CDPD) mode. A...http://www.google.co.uk/patents/US6434395?utm_source=gb-gplus-sharePatent US6434395 - Portable communications and data terminal having multiple modes of operation
