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So, technically it is a modem, USB and (due to the CDFS format) virtual CD-ROM device.Basically, what has been done is that you have removed the initial inclination to treat the device only as a bulk storage (removing the module that handles that).You've also manually caused the recognition of the device (using the modprobe command).So that when you re-plugged it, it should now be able to work with the modem part of the device addressing it as /dev/tty USB0, rather than that being the bulk storage device (virtual CD-ROM).The Huawei E220 is a Huawei HSDPA access device (modem) manufactured by Huawei and notable for using the USB interface (USB modem).
Technically it is a modem, USB and (due to the CDfs format) virtual CD-ROM device.
Launched on 21 June 2006, the device is used for wireless Internet access using 3.5G, 3G, or 2G mobile telephony networks.
It supports UMTS (including HSDPA), EDGE, GPRS and GSM.
E220 works well with Linux, as support for it was added in Linux kernel 2.6.20 (2007-02-04 formatted with CDfs, thus emulating a CD-ROM drive.
In this memory, E220 devices supplied by mobile operators may contain 3G dialer software written by the operator, while Huawei-branded devices contain Huawei's original dialing software, which they call 'Dashboard'.
Huawei's Dashboard and updates for it are also available from Huawei's website, or the 11.3.01 firmware for 7.2 Mbit/s from Net Com (in reality 'flashing' this device means writing a firmware image to its internal flash memory, which is different from "updating the dashboard", which is simply writing a new CDFS disc image to the USB mass storage device that appears in the operating system).