E220 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. 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.
The device contains not only the cellular antenna but also about 22 MB (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. 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 11.313.02.00.01 firmware for 7.2 Mbit/s from NetCom (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). Flashing the firmware of this device doesn’t change the USB Mass Storage memory used for the operator’s software, therefore connection settings (such as APN) will be retained. When the device is first attached, Windows will automatically run the software stored on it, unless that feature has been turned off in Windows. This feature can be bypassed by pressing the Shift key while attaching the device, or by turning off the autostart feature entirely. It is possible to remove the operator branding by flashing the device with Huawei’s Mobile Partner software. Huawei does not publicly release firmware updates for its devices, only Dashboard updates. The standard way of obtaining firmware updates is through the service provider, however some firmware updates are publicly available over the Internet and some users have cross-flashed (i.e. using a firmware provided by service provider “X” with modem supplied by service provider “Y”) their modems without trouble. Updating the modem’s Dashboard does not remove or affect the network-lock (that may be in effect with modems purchased subsidized from a service provider) that prevents you from using the modem with any service provider. However updating the modem’s firmware may remove this network-lock or even the opposite, turn a network-lock free modem into a locked one.
The E220 connects to the computer with a standard Mini USB cable. The device comes with two cables, one short and one long. The long one has two USB A interfaces, one used for data and power and the other optionally only for assistance power in case the computer is not able to provide the full 500 mA (milliamperes) required for the device to work from one USB interface only. If your connection gets disrupted often or isn’t really stable (or you can surf at slow speed only), consider using the two plug USB cable.
The E220 antenna is internal; the USB cable does not act as an antenna. The external antenna connector is not accessible without opening the device (voiding any warranty). It is still possible to connect an external antenna  without opening the device and using the (internal) external antenna connector. Together with a high gain antenna like an LPDA or an OMNI booster antenna and an adapter, signal strength can be considerably improved. There is also a way to do this, open the modem, remove the small internal antenna, and solder a UMTS-antenna cable onto the board. You will invalidate the warranty, but it can be a cheap and functional way to connect an external antenna. 
The Huawei E220 includes its own Windows software in its internal memory, which self-installs through the Windows’s auto-start feature and can be flashed (overwritten) by the end user. The standard software by Huawei is called Mobile Partner and is indicated by the code UTPS.
Some network operators selling the E220, however, replace Huawei’s software with their own, which often is software-locked (albeit not SIM-locked) to work only with the operator’s own network. End-users can use either third-party software such as MWconn (freeware) or alternative operating systems (e.g. Linux) to circumvent this and use their E220 with any SIM, or flash their device with Huawei’s original software.[dubious – discuss]
Since the release of Windows 7 users have reported a number of issues that require a firmware upgrade to the modem. Huawei have released new firmware to the operators, who have generally made it available on their websites. The firmware upgrade must be carried out from a machine running Windows XP or Windows Vista and which can see the modem. Once this is complete Windows 7 can see and use the modem.
The following operator(s) are known to replace Huawei’s software with their own:
- Metfone (Cambodia)
- BT Business (UK)
- BASE eplus (Germany)
- Claro (Americas)
- Dialog Axiata (Sri Lanka)
- Drei (Austria)
- Zain (Nigeria)
- Visafone (Nigeria)
- Mobilkom Austria (Austria) – uses software from Austrian software vendor mquadr.at for both its brands A1 and Bob.
- Movistar (Spain, Argentina)
- Mobily (Saudi Arabia)
- VIVA (Kuwait)
- MTN (Uganda)
- MTN SA (South Africa)
- mt:s (Serbia)
- MTC (Namibia)
- MTS (Russia)
- Multilinks TeleKoms (Nigeria)
- Nawras (Oman)
- Optimus Telecomunicações (Portugal)
- Orange (Austria)
- Play Mobile (Poland)
- Sun Cellular (Philippines)
- T-Mobile (Austria)
- Turkcell (Turkey)
- Telkomsel & Axis (Indonesia) (but not sim-locked)
- Three (Australia, Austria, Italy, UK, Sweden)
- WIND Greece
- Vodacom SA (South Africa)
- Safaricom (Kenya)
- Vodafone – Vodafone puts on its E220 (Vodafone Mobile Connect USB Modem) its Windows Vodafone Mobile Connect Lite software, which is a lighter version of Vodafone Mobile Connect. In Windows it uses the excutable VodafoneUSBPP.exe. This device is also supported in Linux, using Vodafone Mobile Connect Card driver for Linux, which can be downloaded from Vodafone Betavine. – Vodafone in New Zealand markets the Huawei D220 as the Vodem.
- Zain (Sudan)
 Operating systems
- Microsoft Windows XP, Vista and 7
- Mac OS X v10.2.6 Jaguar or higher
- Linux 2.6.20 or higher. One can use wvdial or NetworkManagerwith this modem in Linux.
 Compatibility issues
A number of software compatibility issues are known to exist with the E220 USB modem. This is mainly related to CD Writing software, software that creates virtual CD-ROM drives  and with Microsoft ActiveSync. Also early versions of the firmware and Vodafone Connect software are incompatible with Windows Vista. This has been remedied in later updates.