Geiger, many, if not most, of the Whirlpool n900 users only see one thread in the phones section of Whirlpool and that is the main "Nokia N900 Maemo Linux phone thread - Part 11!"
Maybe if you had posted there you would have got some help. I know for a fact many of the users in that thread use Optus, or optus resellers.
The n900 thread at WP is 11 parts and over 500 pages in total. A new thread wasn't the right idea.
So have another go at posting your question, but in the thread I mentioned above.