How and why are you getting an unlocked phone, putting in one sim, filling in a form then putting another sim in?
The CPW iPhones lock to the network of the first sim you put in. I put my 3 sim in (I wanted to use 3 anyway, but wanted it unlocked), so it was locked to the 3 network.
3 have an unlock form on their support page. They then sent me a text about 4-5 hours to confirm the unlock, but that I needed a sim on another network to complete the process. It said to put in the sim (T-mob) and connect to iTunes.
I had to enter my iTunes details on my phone again, but after that it was complete
Hope this helps.