After reading the postive review, I bought this adapter. Turned out to be a piece of junk, and am returning it.
a. It doesn't tell you on the website that it needs a Q Power FC5 iphone cover [...], until you get the adapter
b. Even without the adapter (for keeping the SIM-2 out of the way), SIM-1 does not fit into the SIMCARD slot of the iphone and just sticks out, with the phone not recognizing it.