Use Huawei E8231 as a 3g modem

I'm using Gentoo, and I have a problem with the 3g modem Huawei E8231. As far as I understand, to make it work I should switch its mode: $ lsusb Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 8087:07dc Intel Corp. Bus 001 Device 004: ID 0bda:572a Realtek Semiconductor Corp. Bus 001 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver Bus 001 Device 011: ID 12d1:1f01 Huawei Technologies Co., Ltd. E353/E3131 (Mass storage mode) Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub # usb_modeswitch -v 12d1 -V 12d1 -p 1f01 -P 14db -M "55534243123456780000000000000011062000000101000100000000000000" $ lsusb Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 8087:07dc Intel Corp. Bus 001 Device 004: ID 0bda:572a Realtek Semiconductor Corp. Bus 001 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver Bus 001 Device 012: ID 12d1:14db Huawei Technologies Co., Ltd. E353/E3131 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub # dmesg [19469.255798] usb 1-3: new high-speed USB device number 11 using xhci_hcd [19469.396894] usb 1-3: New USB device found, idVendor=12d1, idProduct=1f01 [19469.396898] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [19469.396900] usb 1-3: Product: HUAWEI Mobile [19469.396901] usb 1-3: Manufacturer: HUAWEI [19469.396903] usb 1-3: SerialNumber: FFFFFFFFFFFFFFFF [19469.397809] usb-storage 1-3:1.0: USB Mass Storage device detected [19469.397868] scsi host5: usb-storage 1-3:1.0 [19470.397691] scsi 5:0:0:0: CD-ROM HUAWEI Mass Storage 2.31 PQ: 0 ANSI: 2 [19470.470961] sr 5:0:0:0: [sr0] scsi-1 drive [19470.471189] sr 5:0:0:0: Attached scsi CD-ROM sr0 [19470.471320] sr 5:0:0:0: Attached scsi generic sg1 type 5 [19591.778652] usb 1-3: USB disconnect, device number 11 [19592.095020] usb 1-3: new high-speed USB device number 12 using xhci_hcd [19592.238652] usb 1-3: New USB device found, idVendor=12d1, idProduct=14db [19592.238655] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [19592.238658] usb 1-3: Product: HUAWEI Mobile [19592.238659] usb 1-3: Manufacturer: HUAWEI [19592.311677] cdc_ether 1-3:1.0 eth1: register 'cdc_ether' at usb-0000:00:14.0-3, CDC Ethernet Device, 00:1e:10:1f:00:00 # usb-devices T: Bus=01 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 12 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=02(commc) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=12d1 ProdID=14db Rev=01.02 S: Manufacturer=HUAWEI S: Product=HUAWEI Mobile C: #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=500mA I: If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=cdc_ether I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether It seems that everything is ok, but there aren't any new devices or interfaces: $ ls /dev | grep ttyUSB #empty result $ ifconfig #no usb0 eth0: flags=4099 mtu 1500 ether c4:54:44:b2:ca:45 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 0 (Local Loopback) RX packets 9445 bytes 5167034 (4.9 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 9445 bytes 5167034 (4.9 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 wlan0: flags=4163 mtu 1500 inet 192.168.0.100 netmask 255.255.255.0 broadcast 192.168.0.255 inet6 fe80::fa16:54ff:fe6e:2940 prefixlen 64 scopeid 0x20 ether f8:16:54:6e:29:40 txqueuelen 1000 (Ethernet) RX packets 875123 bytes 1243972975 (1.1 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 391840 bytes 42394343 (40.4 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Wat's wrong? *note: I also asked this question on gentoo forum *