The portable wifi network is from a third-party carrier
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First, the use of portable wifi do not need to buy traffic!
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Second, portable wifi is plugged into the computer USB interface of a mini router, you can do AP (that is, hot spot), wireless relay, come with a driver, cheap, small and mini, easy to install! The disadvantage is that you need to rely on a computer that can access the Internet (wired and wireless), the WIFI transmission distance is relatively close (about 30 meters), the \"through the wall\" effect is general, suitable for business trips, travel temporary WIFI network for mobile phone use.
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Third, the use of portable wifi, is to rely on the existing network (wired or WIFI network) a computer to achieve its function, itself will not generate any traffic, if the computer can access the Internet does not generate network costs, it is completely free; If the computer is using the traffic of 3G or 4G mobile phone card to access the Internet (some notebooks can be inserted into the mobile phone card, in general, the use of 3G, 4G router to connect to the computer to share), traffic will be generated! So it depends on the Internet environment