"Let's be together" means that everyone pulls a telephone line? If that's what you mean, it's not worthwhile, it's too expensive. Not recommended.
Wireless (built with a wireless router, that's what you mean) is relatively unstable, but the dormitory space is generally not large, and it doesn't matter much if the distance is short. If it really doesn't work, you can use a network cable for your notebook. The advantage is that you only need to pull a telephone line, and both dormitory notebooks and desktops can access the Internet. The network speed mainly depends on the broadband you pull. For example, if you pull a 4M telecom broadband for four people, the average bandwidth of each person is 1M, which should be enough. Recommend this plan.
Specific implementation: buy a multi-port wireless router, wireless can be used for notebook wireless network cards, LAN ports must be practiced with network cables. Generally, if there is no wireless network card on the desktop, you can use the network cable (of course, the laptop can also use the network cable, but the network speed will be better). Then go to telecommunications or something, pull up a telephone line and dial up the internet with a router. If there are many people, you can increase the broadband, 4m, 10m, and do what you can. . . . It's not easy to hit by hand. . .