DTC...I have little experience of telephone Polls, but I do know that they are conducted with the same rigour as face-to-face Polls....ie, that as wide a spread of different social groups, ages and locations is used.
This is to ensure that the info gathered is representative of the country as a whole. They are not perfect but then again no Polls are, including the ones where we actually go into a booth and vote. For instance, even in General Elections, the turn out rarely goes above 75%, which means that 25% of the population has not expressed and opinion one way or the other.
The turn out would have to be very close to 100% before it really reflected the "will of the people"
Its further complicated by the other-than "first past the post" method of voting, which will be used here in Wales next week.
Even when all, or most of the Polls agree with each other, they still don't get it 100% right...there is a margin of error after all.
My best guess, and its only a guess, is that the forthcoming Referendum will be close, one way or the other, with a huge variation when it comes to location, occupation and age of the voter.
Not sure if the above helps DTC !