Hi, I just tried on Raspberry Pi with a Huawei E1550 and I got 3devices - USB0,1,2, however, when making a call the USB device name seems changed to USB3,4. Seems whenever making a call the device changes even no mod_gsmopen loaded. I tested I can send text message without problem. questions - 1) Is this because the audio is locked? How do I check if it's locked or not? 2) If not, why the device name keeps changing? it there a way to avoid that? 3) I got 3 devices when plug the USB, is that normal? how do I tell which one is control and which one is audio? It seems the last one is control. And the third one maybe 3G? Thanks, below is some log from /var/log/message Apr 16 20:41:44 raspberrypi kernel: [40750.001897] usb 1-1.2: USB disconnect, device number 9 Apr 16 20:41:44 raspberrypi kernel: [40750.002605] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0 Apr 16 20:41:44 raspberrypi kernel: [40750.002686] option 1-1.2:1.0: device disconnected Apr 16 20:41:44 raspberrypi kernel: [40750.002963] qmi_wwan 1-1.2:1.1: wwan0: unregister 'qmi_wwan' usb-bcm2708_usb-1.2, WWAN/QMI device Apr 16 20:41:44 raspberrypi kernel: [40750.010340] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4 Apr 16 20:41:44 raspberrypi kernel: [40750.010425] option 1-1.2:1.2: device disconnected Apr 16 20:41:44 raspberrypi kernel: [40750.018266] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5 Apr 16 20:41:44 raspberrypi kernel: [40750.018360] option 1-1.2:1.3: device disconnected Apr 16 20:41:44 raspberrypi kernel: [40750.269178] usb 1-1.2: new high-speed USB device number 10 using dwc_otg Apr 16 20:41:44 raspberrypi kernel: [40750.382002] usb 1-1.2: New USB device found, idVendor=12d1, idProduct=1003 Apr 16 20:41:44 raspberrypi kernel: [40750.382036] usb 1-1.2: New USB device strings: Mfr=2, Product=1, SerialNumber=0 Apr 16 20:41:44 raspberrypi kernel: [40750.382052] usb 1-1.2: Product: HUAWEI Mobile Apr 16 20:41:44 raspberrypi kernel: [40750.382066] usb 1-1.2: Manufacturer: HUAWEI Technology Apr 16 20:41:44 raspberrypi kernel: [40750.512562] usb 1-1.2: USB disconnect, device number 10 Apr 16 20:41:49 raspberrypi kernel: [40755.099352] usb 1-1.2: new high-speed USB device number 11 using dwc_otg Apr 16 20:41:49 raspberrypi kernel: [40755.210452] usb 1-1.2: New USB device found, idVendor=12d1, idProduct=140c Apr 16 20:41:49 raspberrypi kernel: [40755.210486] usb 1-1.2: New USB device strings: Mfr=2, Product=1, SerialNumber=0 Apr 16 20:41:49 raspberrypi kernel: [40755.210502] usb 1-1.2: Product: HUAWEI Mobile Apr 16 20:41:49 raspberrypi kernel: [40755.210516] usb 1-1.2: Manufacturer: HUAWEI Technology Apr 16 20:41:49 raspberrypi kernel: [40755.218266] scsi25 : usb-storage 1-1.2:1.0 Apr 16 20:41:49 raspberrypi kernel: [40755.224063] scsi26 : usb-storage 1-1.2:1.1 Apr 16 20:41:49 raspberrypi kernel: [40755.227981] usb 1-1.2: USB disconnect, device number 11 Apr 16 20:41:56 raspberrypi kernel: [40762.009397] usb 1-1.2: new high-speed USB device number 12 using dwc_otg Apr 16 20:41:56 raspberrypi kernel: [40762.120656] usb 1-1.2: New USB device found, idVendor=12d1, idProduct=140c Apr 16 20:41:56 raspberrypi kernel: [40762.120688] usb 1-1.2: New USB device strings: Mfr=2, Product=1, SerialNumber=0 Apr 16 20:41:56 raspberrypi kernel: [40762.120705] usb 1-1.2: Product: HUAWEI Mobile Apr 16 20:41:56 raspberrypi kernel: [40762.120720] usb 1-1.2: Manufacturer: HUAWEI Technology Apr 16 20:41:56 raspberrypi kernel: [40762.131735] option 1-1.2:1.0: GSM modem (1-port) converter detected Apr 16 20:41:56 raspberrypi kernel: [40762.132274] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB0 Apr 16 20:41:56 raspberrypi kernel: [40762.138276] qmi_wwan 1-1.2:1.1: cdc-wdm0: USB WDM device Apr 16 20:41:56 raspberrypi kernel: [40762.142683] qmi_wwan 1-1.2:1.1: wwan0: register 'qmi_wwan' at usb-bcm2708_usb-1.2, WWAN/QMI device, ea:1a:89:2e:60:ec Apr 16 20:41:56 raspberrypi kernel: [40762.148396] option 1-1.2:1.2: GSM modem (1-port) converter detected Apr 16 20:41:56 raspberrypi kernel: [40762.148977] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB3 Apr 16 20:41:56 raspberrypi kernel: [40762.153480] option 1-1.2:1.3: GSM modem (1-port) converter detected Apr 16 20:41:56 raspberrypi kernel: [40762.154368] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB4 Apr 16 20:41:56 raspberrypi kernel: [40762.156892] scsi31 : usb-storage 1-1.2:1.4 Apr 16 20:41:56 raspberrypi kernel: [40762.161995] scsi32 : usb-storage 1-1.2:1.5 Apr 16 20:41:57 raspberrypi kernel: [40763.153006] scsi 31:0:0:0: CD-ROM HUAWEI Mass Storage 2.31 PQ: 0 ANSI: 2 Apr 16 20:41:57 raspberrypi kernel: [40763.164198] scsi 32:0:0:0: Direct-Access HUAWEI MMC Storage 2.31 PQ: 0 ANSI: 2 Apr 16 20:41:57 raspberrypi kernel: [40763.166151] sr0: scsi-1 drive Apr 16 20:41:57 raspberrypi kernel: [40763.175965] sd 32:0:0:0: [sda] Attached SCSI removable disk -- Seven Du http://www.freeswitch.org.cn http://about.me/dujinfang http://www.dujinfang.com Sent with Sparrow (http://www.sparrowmailapp.com/?sig)