I currently have a Blackberry 9780 for T-Mobile that is unlocked for my network, AT&T. I love the phone, however I wish I could have 3G. I recently purchased a used 9780 for Telus (I bought it with a cracked screen and a few other issues - i'm in the process of fixing it), and I was wondering if I would be able to get 3G once I unlock it, given that it would be used under AT&T.

Thanks