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 firmware. The device contains not only the cellular antenna but also about 22MB (10 MB on older versions) of storage memory accessible to the operating system as a USB mass storage device ] formatted with CDFS, thus emulating a CD-ROM drive. Unlocked and unbranded modems can also be bought from independent suppliers. Most 3G network operators bundle the device with a contract, with some operators simlocking ] the device.

The card is also supported by Vodafone Mobile Connect Card driver for Linux, and it is possible to monitor the signal strength through other Linux applications. It supports UMTS (including HSDPA), EDGE, GPRS and GSM.Į220 works well with Linux, as support for it was added in Linux kernel 2.6.20, but there are workarounds for distributions with older kernels pl icon ] ] ] (eg for Debian etch's 2.6.18). Launched on 21 June 2006 ], the device is used for wireless Internet access using 3.5G, 3G, or 2G mobile telephony networks. Technically it is a modem, USB and (due to the CDFS format) virtual CD-ROM device. The Huawei E220 is a Huawei HSDPA access device (' ' modem' ') manufactured by Huawei and notable for using the USB interface (USB modem).

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