My HTC Touch Diamond phone doesnt next G on the...

Question

My HTC Touch diamond works on 3G in Malaysia where it was bought however doesnt have the 3G - MMS and video conferencing etc Functions on my Australian Telstra "Next G" Network - can someone help me put the settings in to make it work there please??

Maybe for others, if someone knows the settings for the Optus Australian 3G network for the same phone it will save someone asking about that as well.

Thanks

HOward