Yes, I do have the correct Blackberry Data plan with AT&T and my previous device was a Curve. This is a physically unbranded 8820 but it must have been used on the Orange network before I bought it because I can't install AT&T OS without deleting vendor.xml and after a wipe/install there's a message that says "Welcome to Orange UK" etc. etc. I've tried registering the device from the Host Routing Table and I never get the registration message back. Just plodding along in lowercase edge hell. Is there anything else I can do or am I going to have to sell this phone?