Leonedes wroteAny blackberry can run on the 3G networks if the device supports it, if it doesnt, it should work with EDGE perfectly. Note that the browser on the new BB OS wont work without importing Service Books from a blackberry running the OLD OSes. You should also add the apn settings to your bb device, I forgot how to do so, but you should be able to find it on this forum as I had the same problem before.
I just turned on my old BB Torch, and put in it my Sim Card which has an active 3G subscription with MTC, it worked perfectly, whatsapp and browsing in opera. I didnt even have to change settings because I had already imported service books a long time ago when I subscribed to GPRS, its weird I know but I can confirm it works 100%. The only thing is I forgot what the settings were, but it truely does work.
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the phone is a blackberry curve 8520 , he had bis first , now thought of just using whatsapp thinking he will get edge even if the area is still not covered yet with 3g , he did manage now to change the apn to mtc as the website recomends , but still nothing .