since the wifi that I am using does not allow me even to connect to my vpn, the only way that I have to visit facebook etc. is surfing with Tor browser, as I do on my laptop. Is there a way to use the Tor network on my phone with windows phone 8.1?
There is currently no supported version of Tor or the Tor Browser that would allow you to connect to the Tor Network in Windows Phone. However, you can buy a Raspberry Pi and set it up as a Tor router, then to connect to that "Torified" Wifi.