这个软件是用于linux下usb设备切换模式的软件，如果你的usb modem没有linux下的驱动的话，不妨试试这个，已经支持很多3G usb modem了。-USB_ModeSwitch is (surprise!) a mode switching tool for controlling "flip flop" (multiple device) USB gear

USB_ModeSwitch is (surprise!) a mode switching tool for controlling "flip flop" (multiple device) USB gear. Several new USB devices (especially high-speed wireless WAN stuff, there seems to be a chipset from Qualco