Playing Cat and Mouse with Unlocking Apple Iphones is always going to be a never ending story.
If you have an iphone running the iPhone 4 OS 4.2.1 Baseband 2.10.04 then at the moment for some time its not going to be possible to unlock via unlock this via jailbreak hacks for now.
This realy casues complications for users who are stuck with an iphone and can at most use it as an ipod or use it only with the network opertators simcard that is has been locked on to.
But this is no good to those who have an iphone and no active services for the network the iphone is locked on to.
Unlocking for the the 4.2.1 firmware can only be done via Factory Unlocking Services via Itunes where you only to supply the IMEI number of your phone to us and we are able to activate the unlock Legitimately for you via Itunes.