Just a reminder to check your mobile plan regularly. I signed up for a Spark plan when I got my phone a couple of years ago, and of course the price was fixed during that contract. When I came off the contract I didn't check the plans available. I just saved $10 a month by changing to a comparable plan that's currently offered. I'm trying to find my historical usage to see if I'd be better on prepay, but that's another story.
The same thing happened on TelstraClear when I was with them - prices went down, current customers kept paying old prices, so check them too.