Looking for unlock code for Siemens MC60

Hi,

I have been looking for a way to unlock my Siemens MC60. I purchased this from a lady in Queensland on Ebay.com.au a few days ago. And after I had paid for it she told me it was locked to the T-Mobile network in the UK. So it will be of no use to me in Australia. Feels like a waste of a lot of money. Anyway, it came with a data cable, been told I need that to unlock it.

Is there anyone that will be able to help me? I spent almost $200 for the phone and I don't want to pay more and more for it if it is not going to do me any good. I may as well spend it on my kids for christmas.

PLEASE SOMEONE HELP ME!
Thank you
DatHacket.