GalahOnTheBay said..If so - why?

Because most residential numbers on whitepages.com.au are landline numbers and overseas telemarketers probably have used this info as a basis. It's mostly senior people who own residential landlines and that's who they exploit.
I had this issue when I had my landline and got it disconnected in 2007. However, my parents can't get over not having one. They like Loftywind get smashed (up to 40 telemarketer calls on bad day). I've given up trying to talk them into getting it disconnected and having their internet either replaced with naked ADSL or a 3G dongle. I've made it a rule now that they don't whinge it me about it

Note: Both parents have owned mobiles for over a decade. My Mum has had the same mobile number. They have never had an issue with telemarketers on their mobiles. Their mobile numbers aren't listed on Whitepages.
J