I may have discovered who or what this is from! I have magicjack, and I was getting calls like this on my phone, and I always wondered why? But it turns out that it is related to the call-forwarding feature! This is how I found out:
1) Got a call on my BlackBerry Curve 8900, and it said it was forwarded from (404) 462-0000, BUT also displayed the number that the caller was using.
2) Got the idea to call my magicjack number myself from another phone, and have my cell ring (via forwarding)
3) My BlackBerry rings and quickly shows a message that indicates that the call is a forwarded call. The call also displays the number I am dialing from, however, it also shows the number that it was forwarded from ONLY when I answer the call.
So the rule of thumb is that you either have to answer the call to tell if it is forwarded, or you have to be looking at the phone when it rings to know. Finally, problem solved!