IF someone is calling you from a blocked number, is there a way to find out who they are?

Nope, that's why it's blocked

Yes it is now possible to find out the real number when you receive a blocked or restricted call on your mobile phone. You can even find out the name and address of the blocked number.

Unblock restricted numbers using Trapcall's Bug, Mouse, or Bear Trap (http://www.horsebanger.com/spoofcard/unblock-restricted-numbers.html)