There is no mandatory security broadband once must pay for three years, the general situation is the installation of broadband installation fee is not included in the network fee, there will be an installation fee, the price varies by place, the network fee can pay a month, half a year, a year, can also be longer, is usually said to be a month and a year, the annual package than the monthly cost; The network fee is like the phone fee, it will be charged when it is used up, and the installation fee is not charged after the first installation, I hope it can help you!