Game cards will work no matter where you are from and where they are bought.
If you absolutely want an sms/phone pin from Australia I work as an associate of YoHoJo and I am based in Australia so we can organise a legit sms/phone pin for you if you'd like. However a game card would be simpler...
P1ng from Memberize.me here - You posted on our thread requesting an upgrade.
I can complete your order right away.
My contact details have been sent to you via PM :)
Hi this is P1ng here ready to complete your order. Could you please PM me your skype/msn details so that I may process your order as quickly as possible.
What are the errors you are recieving? Chances are they are related to the latest update of Simba (a little while ago now), but an awful lot of scripts haven't been updated to be compatible.
Feel free to either post back here, PM me/add me on MSN/Skype.