RailWire subscribers need not buy prepaid wi-fi plans at railway stations and can use their RailWire FTTH (Fiber to the home) subscriptions on RailTel's Wi-Fi network, the rail PSU said on Saturday. "To avail this facility they just need to use their Smartphone, switch on Wi-Fi, select RailWire SSID and click hyper link provided on captive portal (log in screen) to punch RailWire user ID and password.