you can better check the limewire downloads !!
you might find a lot of codes sim lock free and more !!
you can download it at www.limewire.comwww.limewire.nl
first download a free version
second search in programs ( in limewire free version)
and 3th Searg at all kind or something for it just right in your model mobile and what your searching like Sony Ericsson SimUnluck and woila !!
Hey you can unlock your mobile using the codes.
Most of the free service does not work properly..So better you purchase the unlocking service from http://www.wickedunlock.com/ . With the help of this you can unlock your mobile easily.