The Huawei E220 is a

Huawei Huawei Technologies Co., Ltd. ( ; ) is a Chinese multinational technology corporation headquartered in Shenzhen, Guangdong, China. It designs, develops, produces and sells telecommunications equipment, consumer electronics and various sma ...

HSDPA High Speed Packet Access (HSPA) is an amalgamation of two mobile protocols—High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)—that extends and improves the performance of existing 3G mobile telecommunic ...

access device (

modem A modulator-demodulator or modem is a computer hardware device that converts data from a digital format into a format suitable for an analog transmission medium such as telephone or radio. A modem transmits data by modulating one or more c ...

) manufactured by

and notable for using the USB interface (USB modem). Technically it is a modem, USB and (due to the CDfs format) virtual

CD-ROM A CD-ROM (, compact disc read-only memory) is a type of read-only memory consisting of a pre-pressed optical compact disc that contains data. Computers can read—but not write or erase—CD-ROMs. Some CDs, called enhanced CDs, hold both com ...

device. Launched on 21 June 2006,Huawei Terminal
the device is used for wireless

Internet The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, p ...

access using

3.5G High Speed Packet Access (HSPA) is an amalgamation of two mobile protocols—High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)—that extends and improves the performance of existing 3G mobile telecommunica ...

, 3G, or 2G mobile telephony networks. It supports

UMTS The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the In ...

(including

EDGE Edge or EDGE may refer to: Technology Computing * Edge computing, a network load-balancing system * Edge device, an entry point to a computer network * Adobe Edge, a graphical development application * Microsoft Edge, a web browser developed ...

GPRS General Packet Radio Service (GPRS) is a packet oriented mobile data standard on the 2G and 3G cellular communication network's global system for mobile communications (GSM). GPRS was established by European Telecommunications Standards Ins ...

and

GSM The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation ( 2G) digital cellular networks used by mobile devices such ...

. E220 works well with

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, whi ...

, as support for it was added in

Linux kernel The Linux kernel is a free and open-source, monolithic, modular, multitasking, Unix-like operating system kernel. It was originally authored in 1991 by Linus Torvalds for his i386-based PC, and it was soon adopted as the kernel for the GNU ...

2.6.20 (2007-02-04), but there are workarounds for distributions with older kernels.Huawei E220 HSDPA USB 3G Modem in Linux
/ref>
/ref>Kernel.org

/ref> 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.
/ref> Most 3G network operators bundle the device with a contract, with some operators simlocking the device. Unlocked and unbranded modems can also be bought from independent suppliers.

Features

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 deviceUsing Huawei E220 with Debian/Linux
formatted with CDfs, thus emulating a CD-ROM drive. In this memory, E220 devices supplied by mobile operators may contai
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,Huawei Terminal
/ref> 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-unlock or even the opposite, turn a network-unlock free modem into an unlocked one.

Hardware

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 the connection is frequently disrupted or is unstable (or usable at slow speeds only), the two plug USB cable should be used instead. 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, which together with the use of a high gain antenna like an LPDA or an OMNI booster antenna and an adapter, can considerably improve signal strength. Another cheap and functional way of connecting an external antenna is to open the modem, remove the small internal antenna, and solder a UMTS-antenna cable onto the board, though this invalidates the

warranty In contract law, a warranty is a promise which is not a condition of the contract or an innominate term: (1) it is a term "not going to the root of the contract",Hogg M. (2011). ''Promises and Contract Law: Comparative Perspectives''p. 48 Cambri ...

Software

The Huawei E220 includes its own

Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for se ...

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 operator A mobile network operator (MNO), also known as a wireless service provider, wireless carrier, cellular company, or mobile network carrier, is a provider of wireless communications services that owns or controls all the elements necessary to sell ...

s selling the E220, however, replace Huawei's software with their own, which often is software-locked (

albeit {{Short pages monitor