(There are loopholes in any billing system in Internet cafes. The most important thing is to first know which billing system the Internet cafes use, and then find a way to crack it. Find the icon in the lower right corner (that is, the one you check how much you paid for). chart), eight is software such as Vientiane network management. Download similar software to learn gradually, you can recharge for free, and you can also surf the Internet unlimitedly)