Nearly four months after moving in, we're nearing the end of our broadband saga. Smart sent us our modem and login details. So, I plugged the phone into the wall socket in our bedroom - no dialtone. There's another wire coming up through the wall in our living room, presenting Cat 5 - I wired together a socket using the usual combination of blue -> red, white/blue -> green, but to no avail. In desperation, I yanked the face-plate off the wall socket in the bedroom and found that it wasn't actually connected to anything.
Smart were very nice about the whole thing, merely remarking that the whole situation was "very unusual" (a very diplomatic way of saying "My word, you're a moron for not checking this earlier").
Either way, Eircom engineers are on their way out to us and we should be hooked up by next week.