The extra devices created are useful to get and query the internal modem state while the main one is in use (you may try the cat command on them). The Nokia phones use other device names, like ttyACM0. In this computer there are 2 devices available: a internal 3G modem ( ttyUSB0) and a external 3G dongle ( ttyUSB3). Usb 2-2: GSM modem (1-port) converter now attached to ttyUSB4 Usb 2-2: GSM modem (1-port) converter now attached to ttyUSB3 Usb 1-6: GSM modem (1-port) converter now attached to ttyUSB2 Usb 1-6: GSM modem (1-port) converter now attached to ttyUSB1 Usb 1-6: GSM modem (1-port) converter now attached to ttyUSB0 You simply may look at /var/log/messages to discover the device names appeared when the modem is plugged in. This guide assumes that your modem hardware is properly detected and working. Nokia CS-15 (lsusb says 0421:0612 Nokia Mobile Phones).Nokia N73 (USB tethering select "PC Suite" when the phone asks).Huawei E220 and E1552 external USB dongles.Huawei EM770 MiniPCIe modem (Asus Eee PC 1000H Go internal integrated modem).It has been tested and directly works with no modifications (except for the device name) with: The method described supports easy switching between several carriers and 3G and GPRS modes. The only requirement is the ppp package (2.4.5-1 tested). You may be reading this page by the same reason it was written for: you may have finally concluded that the lesser the layers, the less likely the troubles. I particularly switched to direct pppd because my previous software sometimes silently exited instead of reconnecting, as it was configured to do, requiring me to travel to manually perform the reconnection. Why not to use a pppd wrapper (like wvdial or similar)?.
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