VMU oddity

[#1]

VMU for yesterday (first day of our billing month) is showing 1% on Broadband Phone calls. I would normally expect that on Xmas Day but this year we didn't make our customary Xmas call to Australia, as our friends there are going to ring us today instead. Besides that, my Skype credit recently ran out, I haven't got my VoIP phone plugged into the computer and there's no use showing on my PlusNet Broadband Phone account (not sure if the software is set up properly either as I haven't used it in a while since going over to PlusNet landline phone with free weekends and evenings).
So, is it possible for anything else to show up as broadband phone use? 

[#2]

Yes. The VMU is accurate on the quantity of total usage but the breakdown is an estimate.

[#3]

Hmmm. It's now showing as 2% and as paid for whereas it was showing as 1% free use before.
I was wondering if there was anything in particular that might show up as Broadband Phone. I've never seen it before unless I've actually used it.