If your phone is an out of the box 1.1.2 it can't be unlocked using software of any kind.
This site contains any updates on the progress of the hackers working on breaking 1.1.2 OTB to allow unlocking and the last update states it is still not possible to do.
http://docs.google.com/View?docid=dgzw9xs_0gfhxns&pli=1