Wireless network card, plugged into a desktop computer, can surf the Internet.

1. There are two types of wireless network cards: 1 and wireless LAN cards, which are used in conjunction with wireless routers. If you have broadband at home and connect the broadband cable to the wireless router, then a computer with a wireless LAN card can be wirelessly connected to the wireless router and connected to the broadband Internet. The speed is basically the same as that of wired broadband, with a distance of tens of meters and no shielding. You only need to buy a wireless router and wireless network card, and you don't need to pay extra network fees. Notebooks usually have a built-in wireless LAN card. If you want to use a desktop computer, the home USB wireless network card ranges from tens of yuan to more than 100 yuan, and you should also buy a wireless router. General household 100 is enough. Asus ASUS is recommended as a brand. If it is not easy to buy locally, DLINK and TPLINK are also good. 2, wireless network card, is the kind that uses mobile or telecom mobile phone signals to access the Internet, depending on what you mean. Wireless network cards with USB interface can be used for desktops and laptops. It usually takes 300 yuan to buy a wireless network card from the market alone to 400 yuan. Note that the network standards of mobile and telecom are different and incompatible. You need to determine which carrier you use before you buy this standard network card. At present, both China Mobile and China Telecom have given away prepaid cards and network cards. If you buy from the market, the wireless network card is better than Huawei's. 3. The mobile phone is connected to the computer through a data cable, which can be used as a wireless network card, and the speed is basically the same as that of a wireless network card. A mobile phone supporting 3G network can be used as a 3G network modem. You just need to go to mobile or telecom to apply for an Internet package SIM card, and just put it in. Of course, you can add the Internet package to your existing number. Second, the tariff: mobile is generally packet traffic. The basic package is 500m in 50 yuan, 2g at 100 yuan, 5G in 200 yuan, and the excess is 0.0 1 yuan /KB (all provinces and cities have started to adjust it to 1 yuan /MB), and roaming is not limited.

Telecom is generally a package time, the basic package 160 yuan local 300 hours, domestic roaming internet 5 hours; 200 yuan packs 200 hours of Internet access (regardless of local and roaming); 300 yuan Package 360 hours online time (excluding local and roaming). Unicom's daily package and monthly package, daily package: 1 RMB package 3M, and the excess is 0.05438+0 yuan /KB. Monthly package: 50 yuan package 500M80 yuan1g; 3G 150 yuan; 200 yuan Package 5g; 300 yuan bag 10G. If you spend a lot of time online, often chat, browse the web, send emails, fight landlords, etc., and rarely download large pieces, then it is more appropriate to choose mobile packet traffic. If you spend less time online, but will download more online, then it is more appropriate to choose the telecom package time. Unicom is not recommended, because the enterprise strength is too poor, although its WCDMA network industry chain is the richest, but for domestic 3G, the main decisive factor is the strength of operators, and Unicom's current coverage and service are not good. If it is a big city, the coverage of mobile and telecommunications is similar. If it is a small and medium-sized city, the current telecom network coverage is good. 3. Speed: Let me remind you that the theoretical peak value of 3G wireless network cards can reach more than 3M at present, but in practice, due to the strength and stability of wireless signals, the average speed is equivalent to 5 12k ~ 1m wired broadband, and the average download speed is generally 70 ~ 100K per second. If it is used for browsing, sending and receiving emails, chatting and the like, (TDSCDMA for mobile, WCDMA for Unicom and CDMA2000 for telecom are all similar. ) This is still the speed in the city. If it is a county or township, most areas have no 3G network, and will automatically switch to the 2G network. In the 2G network, mobile EDGE is the fastest, and the actual download speed is about 20K per second, compared with CDMA 1X of China Telecom. Secondly, the actual download speed is about 8~ 13K per second. 4. Handling: Just bring your ID card to the mobile and telecom business hall to open an account, just like handling a mobile phone number, except that this is a special data card, and you can only send text messages and surf the Internet, but you can't make phone calls. There is no monthly rent, only a monthly package fee. Of course, you can put your current SIM card into the network card or use it, just add a corresponding Internet subscription.