Summary form only given. Tunable and Reconfigurable applications using RFSOI-on-HR (high resistivity) silicon technology are being deployed in increasing numbers in today's advanced RF cellular handsets in order to provide increasing data rates demanded by the consumer market. These RFSOI solutions are being deployed to meet the demanding specifications of complex 4G RF cellular front-ends with numerous transmit and receive bands, as well as the possibility of multiple antennae and new architectures which involves Uplink and Downlink carrier aggregation. Such new architectures present extreme challenges for conventional fixed band systems composed of PA's, switches and filters. The talk will present a chronology of the RFSOI-on-HR silicon technology development in the industry through the last decade and highlight novel uses of its capabilities in 4G systems as well as the critical specifications needed in this application space.