Why won't my sim card work in my iPhone 4?

I have an iPhone 4s that is originally from Australia. I had my phone unlocked by my carrier back in Australia but now when I try to put my UK sim card in, it pops up with a message that says 'Sim Not Valid'. It says the Sim installed is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. It then tells me to contact my server to get my iPhone unlocked, where as I know my iPhone is already unlocked by my carrier. Any information that would be helpful, is kindly appreciated.
Thank-you!

Well, that message generally means your phone is in fact, not officially unlocked. When your Australian carrier notified you that your unlock request had been processed, did you do as described here:
http://support.apple.com/kb/HT5014

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