Plug-in can be used, portable WiFi is true, its function is like your mobile phone opened a hot spot nature is the same, the use of a traffic card so that the traffic card automatically converted into a hot spot, for you and the people around you to use it, traffic restrictions are also some, depending on what package you buy is ordered. If you exceed this plan, the speed limit will be limited.
Unreliable to go to a good place to get on the net, the general place is not on the net, really.