i have connected my f305 device via usb........and my operating system has found my phone modem but i can not connect my modem to internet..........................................................................to connect your f305 to computer as modem please download the file (Sony_Ericsson_Drivers_3.5.3.0) from www.sonyericsson.com................then install the file and connect your f305...........and u will see operating system automaticlly has found ur phone modem