Wireless modem card is the current period of wireless wide area communication modem is widely used as a communication medium. At present, only both China Mobile GPRS and China Unicom's CDMA (1X) modem standard, Gu wireless card generally only be divided into two categories CDMA wireless LAN and GPRS wireless modem card. Below, we discuss these two types of wireless modem card: First, in accordance with the standard division of the modem can be divided into two categories: China Mobile's GPRS (GeneralPacketRadioService General Packet Radio Service) and China Unicom's CDMA 1X (CodeDivisionMultipleAccess Code Division Multiple Access). Compared to CDMA technology, GPRS technology slightly earlier, and a long-time precipitation, the GPRS modem has a more mature and stable modem performance, as well as signals cover a broader range of access capabilities. However, due to its early development, many future factors not fully taken into account, which to some extent, this has hampered its development, resulting in a technical bottleneck. CDMA technology using its high-speed transmission and new features, and advantages of the new features is slowly expanding their market share, as GPRS strong competitor on the development trend, there is replaced by the taste of. Second, the device interface is divided into the PCMCIA and USB two categories (PDAs with CF slot and some non-mainstream interface type this article is not to discuss). Plug and Play USB interface wireless terminal card features, laptop or desktop can be done through a simple plug connection is working, and because the USB wireless modem card for the external relative to the built-in PCMCIA interface, Wireless The card has a better cooling capacity. The wireless modem card of the PCMCIA interface is designed for notebook computer products, relatively USB interface Wireless LAN products advantage is: built-in notebook computers, and thus avoid the equipment wear, the bump may be, but through the notebook's PCMCIA interface connection, can reduce the occupancy of the wireless modem supplier card on the notebook computer USB port, limited USB interface resources to maximize the available to other equipment used. Third, the connection speed is no doubt that the CDMA modem speed is much higher than the GPRS modem. China Mobile GPRS modem connection speed of 15Kbps to 50Kbps, the actual download rate is 1K to 4K, the pros and cons and depending on the signal. China Unicom's CDMA modem, high-speed limited to 153.6Kbps, actual download speeds of 10Kbps, which is 3-4 times that of GPRS modem. Fourth, wireless LAN products prices, in general, the GPRS wireless modem card is slightly cheaper than the CDMA wireless modem card. GPRS wireless modem card on the price trend is quite stable, common brand products basically stable price of about $ 400. Mainstream CDMA wireless modem card price of 500 yuan, of course, the market there are some high-end HSPA modem offer 800 yuan or more, I personally think that ordinary users need to buy such high-end products, generally priced at 500 Yuan left the product to meet the daily needs. Fifth, the tariff due to the current standard two access methods are a variety of packages, specific criteria can be found in the following websites or contact local business hall.