All said the same story that software for unlocking from three is not available yet;)
What a load of rubbish they have told you...!!!
Iphone 4 can be unlocked with three Uk immediately but for a charge of £15.00 . it takes 24hours you need to ring 333 from your 3 mobile and request unlocking. Only the original owner can request it though.
Google is your friend (sometimes): discussions.apple.com/message/17070471#17070471 last post.