Those Sony Ericsson models are Symbian UIQ. They're actually quite different since they have a touch-screen interface and the UI is very different. We have a P900 here that we intend to get it working on, however it's been a lower priority since those phones are actually not ideal as remote controls. The touch-screen interface is nice, and the display is big, but for channel surfing and other tasks in a dark room, and general remote control operation, most people prefer physical hard buttons. The S.E. Px series don't have an up/down/left/right/enter joystick to navigate on-screen menus. The regular, non-touchscreen phones, while not as "cool", actually make better remotes since they have more physical buttons.