Hi, the device 1c9e/3003 is a 3G-stick sold as "4G Systems W21s", "1und1 UMTS Antenne" and several other names.
After usb-modeswitching to configuration 2 and inserting usbserial for it, it provides ttyUSB[0-3] whereas ttyUSB1 works for connection. BR Bjoern Franke
