People on the LinuxMCE forum confirm that smartphone Nokia N70 can be used as Mobile Orbiter. It’s good because before I heard about support OS Symbian 1th Edition. But N70 is based on Second Edition according to Wikipedia. So, only Third Edition doesn’t allow to run the Orbiter.
Mobile Orbiter uses Bluetooth to communicate with core. It offers function ‘Follow-Me’ transparently. You just leave one room and come to another with your mobile phone with activated Orbiter. Media will follow you in that case.