How to divert calls from nokia 6600 to blackberry curve 8520?

Hi, I got a blackberry curve but its locked by Vodafone (Egypt)
anyway i have a vodafone sim card but my original no. is on (Etisalat) diff. network and it is very important and i can't stop using it

So I had an idea to put my original sim card in my old mobile (nokia 6600) and divert the calls to my new blackberry

Is that anyway possible and if it is,,,please tell me how ???
Thanks =)
 
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