If you’re in Australia, it’s a whole different situation.
Z wave operates on different frequencies in different regions, mostly because mobile phones and ambulance service communications operate on different frequencies and the local Z wave frequency is selected so as not to interfere with the others. In fact, in many areas is illegal to operate Z wave from a different region because of the potential for interference.
http://products.z-wavealliance.org
Currently, the smartthings hub is only manufactured on two frequencies: US and EU. It is not manufactured on the Australia frequency. (A few were for some of the original kickstarter backers.) and because of the legal issues mentioned, you cannot change the frequency of a hub after the time of manufacture.
So many people in Australia just use zigbee devices for home automation. (Zigbee is the same frequency all over the world.)
You can check with some of the other community members from Australia in the following thread: