The P4200 has two IDs, one for CD-Mode, one for modemmode. cd VID 0x106c PID 0x3b14 modem VID 0x106c PID 0x3721 eject /dev/sr0 does work for switching. This (stolen from similar device) usb_modeswitch -v 0x106c -p 0x3b14 -M "555342431234567824000000800008ff024445564348470000000000000000" did work too. The serial modem interface is at /dev/ACM0 Under windows there is a networkcard. At the moment I don't know the driver-candidate for linux. qmi_wwan does catch but not work. Here the output of lusb: Code: Bus 001 Device 010: ID 106c:3721 Curitel Communications, Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 2 Communications bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x106c Curitel Communications, Inc. idProduct 0x3721 bcdDevice 0.00 iManufacturer 3 Pantech, Incorporated iProduct 2 PANTECH P4200 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 189 bNumInterfaces 7 bConfigurationValue 1 iConfiguration 1 Pantech, Incorporated bmAttributes 0xc0 Self Powered MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 2 Communications bInterfaceSubClass 2 Abstract (modem) bInterfaceProtocol 1 AT-commands (v.25ter) iInterface 0 CDC Header: bcdCDC 1.10 CDC ACM: bmCapabilities 0x02 line coding and serial state CDC Call Management: bmCapabilities 0x03 call management use DataInterface bDataInterface 1 CDC Union: bMasterInterface 0 bSlaveInterface 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 5 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 255 Vendor Specific Subclass bInterfaceProtocol 255 Vendor Specific Protocol iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 253 bInterfaceProtocol 255 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x84 EP 4 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x03 EP 3 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 4 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 254 bInterfaceProtocol 255 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x85 EP 5 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x04 EP 4 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 5 bAlternateSetting 0 bNumEndpoints 3 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 240 bInterfaceProtocol 255 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x86 EP 6 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 5 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x87 EP 7 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x05 EP 5 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 32 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 6 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 8 Mass Storage bInterfaceSubClass 6 SCSI bInterfaceProtocol 80 Bulk (Zip) iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x06 EP 6 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x88 EP 8 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Device Qualifier (for other device speed): bLength 10 bDescriptorType 6 bcdUSB 2.00 bDeviceClass 2 Communications bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 bNumConfigurations 1 Device Status: 0x0000 (Bus Powered) dmesg Code: [ 190.244156] usb 1-1: new high-speed USB device number 3 using ehci_hcd [ 190.379095] usb 1-1: New USB device found, idVendor=106c, idProduct=3b14 [ 190.379109] usb 1-1: New USB device strings: Mfr=3, Product=2, SerialNumber=0 [ 190.379118] usb 1-1: Product: PANTECH P4200 [ 190.379127] usb 1-1: Manufacturer: Pantech, Incorporated [ 190.407851] Initializing USB Mass Storage driver... [ 190.408813] scsi4 : usb-storage 1-1:1.0 [ 190.409074] usbcore: registered new interface driver usb-storage [ 190.409081] USB Mass Storage support registered. [ 191.409827] scsi 4:0:0:0: CD-ROM P4200 CDROM 2.31 PQ: 0 ANSI: 2 [ 191.410522] scsi 4:0:0:0: Attached scsi generic sg1 type 5 [ 191.426027] sr0: scsi3-mmc drive: 24x/24x xa/form2 caddy [ 191.426039] cdrom: Uniform CD-ROM driver Revision: 3.20 [ 191.426630] sr 4:0:0:0: Attached scsi CD-ROM sr0 [ 265.841865] usb 1-1: USB disconnect, device number 3 [ 266.448156] usb 1-1: new high-speed USB device number 4 using ehci_hcd [ 266.582835] usb 1-1: New USB device found, idVendor=106c, idProduct=3721 [ 266.582850] usb 1-1: New USB device strings: Mfr=3, Product=2, SerialNumber=0 [ 266.582860] usb 1-1: Product: PANTECH P4200 [ 266.582868] usb 1-1: Manufacturer: Pantech, Incorporated [ 266.613645] cdc_acm 1-1:1.0: ttyACM0: USB ACM device [ 266.616802] usbcore: registered new interface driver cdc_acm [ 266.616811] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters Modeminfo: Code: OK ati Manufacturer: PANTECH Model: P4200 Revision: P4200TEC351F.165 1 [Mar 26 2012 11:07:24] SVN: 01 IMEI: 358923040103757 +GCAP: +CIS707-A, CIS-856, CIS-856-A, +CGSM, +CLTE2 May be someone has some comments/hints to this device. 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