Nowadays, the 3G wireless technology has become more and more important in our life, especially when we work outside the office. Many of my friends are travel through countries for meeting, training, trade, etc, so they need a good USB Modem (AirCard) to be used in the visited countries, that is to say, the Modem should supports as many 3G frequencies as possible. All-in-one wireless USB Modem (Huawei E1823 and E182E) By now, there are a few main frequencies being used for 2G and 3G wireless around the world: 2G: 850, 900, 1800, 1900 3G: 850, 900, 1700, 1900, 2100. The Huawei E1823 and E182E USB Modem support all of these frequencies Huawei E1823 USB Dongle You can connect the E1823 with the USB interface of a computer. In the service area of the HSPA+/UMTS/EDGE/GPRS/GSM network, you can surf the Internet and send/receive messages/emails cordlessly. The Huawei E1823 is fast, reliable, and easy to operate. Thus, mobile users can experience many new features and services with the E1823. These features and services will enable a large number of users to use the E1823. Installation is straight forward plug and play and does not require any additional software or drivers. Simply place your data enabled SIM (not included) into the Huawei E1823 HSPA+ USB Modem and plug modem into the USB slot on your laptop. And you can even get updated firmware to get Huawei E1823 to do 28Mbps mimo. I've also read the Vodafone K4505 is the same device. Huawei E182E USB Stick The Huawei E182E is almost the same as E1823, except it supports 900MHz not 1700 MHz UMTS and it allows users to enjoy Mobile High Speed Internet access from just about anywhere. The Huawei E182E Mobile Internet Key is a retractable USB that will be the alternative device choice within the 3G+ Mobile High Speed Internet category. Specifications (Huawei E1823, E182E, E1820)