I was having a bit of a look on the One-2-call website and noticed they are promoting a 3G SIM and service but can't actually find if and when the network is/will be switched on.

One-2-Call 3G SIM


So...

Is it up and running? Are there any other mobile carriers introducing 3G or already running 3G??

Here at home Telstra has been running 3G through its "Next G" network for quite some time, meanwhile Optus has just turned on its 3G in major cities - interestingly though they both use different frequencies and therefore as far as I'm aware some phones may not actually be compatible with all providers.