My modem works on Karmic amd64. Can you verify that you are using the Karmic kernel? (2.6.31) [21004.262656] usb 1-1: new high speed USB device using ehci_hcd and address 14 [21004.425940] usb 1-1: configuration #1 chosen from 1 choice [21004.579112] Initializing USB Mass Storage driver... [21004.579498] scsi4 : SCSI emulation for USB Mass Storage devices [21004.579803] usbcore: registered new interface driver usb-storage [21004.579810] USB Mass Storage support registered. [21004.590027] usb-storage: device found at 14 [21004.590032] usb-storage: waiting for device to settle before scanning [21004.599240] usb 1-1: usbfs: process 10549 (usb_modeswitch) did not claim interface 0 before use [21004.620712] usb 1-1: usbfs: process 10550 (usb_modeswitch) did not claim interface 0 before use [21004.622713] usb 1-1: usbfs: process 10552 (usb_modeswitch) did not claim interface 0 before use [21004.634712] usb 1-1: usbfs: process 10549 (usb_modeswitch) did not claim interface 0 before use [21006.538652] usb 1-1: USB disconnect, address 14 [21006.850145] usb 1-1: new high speed USB device using ehci_hcd and address 15 [21007.013504] usb 1-1: configuration #1 chosen from 1 choice [21007.015684] scsi5 : SCSI emulation for USB Mass Storage devices [21007.015927] usb-storage: device found at 15 [21007.015932] usb-storage: waiting for device to settle before scanning [21007.108354] usbcore: registered new interface driver usbserial [21007.108354] USB Serial support registered for generic [21007.108380] usbcore: registered new interface driver usbserial_generic [21007.108383] usbserial: USB Serial Driver core [21007.131774] USB Serial support registered for GSM modem (1-port) [21007.131834] option 1-1:1.0: GSM modem (1-port) converter detected [21007.132026] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0 [21007.132026] option 1-1:1.1: GSM modem (1-port) converter detected [21007.132026] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1 [21007.132026] option 1-1:1.3: GSM modem (1-port) converter detected [21007.132138] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2 [21007.132208] usbcore: registered new interface driver option [21007.132208] option: v0.7.2:USB Driver for GSM modems [21012.013999] usb-storage: device scan complete [21012.016170] scsi 5:0:0:0: Direct-Access ZTE MMC Storage 2.31 PQ: 0 ANSI: 2 [21012.017263] sd 5:0:0:0: Attached scsi generic sg2 type 0 [21012.037507] sd 5:0:0:0: [sdb] Attached SCSI removable disk [21058.659069] PPP BSD Compression module registered [21058.694913] PPP Deflate Compression module registered azrael@laptop616:~$ ifconfig ppp0 ppp0 Link encap:Point-to-Point Protocol inet addr:188.33.250.223 P-t-P:10.64.64.64 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 RX packets:12 errors:0 dropped:0 overruns:0 frame:0 TX packets:13 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:234 (234.0 B) TX bytes:249 (249.0 B) azrael@laptop616:~$ lsusb Bus 001 Device 015: ID 19d2:0031 ONDA Communication S.p.A. (I don't know why it's displaying like that) azrael@laptop616:~$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=9.10 DISTRIB_CODENAME=karmic DISTRIB_DESCRIPTION="Ubuntu 9.10" azrael@laptop616:~$ uname -a Linux laptop616 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:05:01 UTC 2009 x86_64 GNU/Linux 2009/11/5 Santiago