Is it possible to get an internet connection from a phone jack?

       I ask because my house is built as such that it would not allow me to get Wi-Fi from a wireless router. My house is built of old materials and my compuer is on the first floor. My games are on the third floor. So, is there any way to use my third floor phone jack to get a connection? Any help is greatly appreciated. Please don't bullcrap me because it's April Fool's day. 

Well I have DSL which runs off a phone jack. I move my router from phone jack to phone jack when necessary. If you have cable then I don't see how you could do this unless you move your computer/router.