I am not sure if you resolved the problem already? But I have a Blackberry 8320 from when I was in Dubai. It was locked to Etisalat.
I was able to get it unlocked through www.unlockology.com.
What I had to do was provide them the 15 digit IMEI of the phone and also the mobile MEP code (they had instructions on the site).
It took less than an hour and I had a code from them that unlocked the device.

I am now back in Brazil for two months before returning to the middle east and the phone works well with the local network provider sim cards (Claro).

So I guess it can be done and it works worldwide.

Have a great day!

Azzendo

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