US user buying Australian Diamond?

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I'm a US T-mobile user. I will be traveling to Australia on business this week.

If I buy an unlocked Diamond in Australia, will it work in the US?

Also, will the GPS work here without any support from T-mobile?

Thanks,
Craig.

Why not just buy a US diamond from bestbuy or various online retailers? GPS will function independent of carrier support. enjoy your trip!

Well Duhhh! I didn't even know BB was selling unlocked diamonds. I didn't want a Sprint contract and didn't want a chopped down one from Verizon.

Thanks!