Unlocking Sony Ericsson K608i

Hi there.

I've just received my Sony Ericsson K608i from 3 (free of charge) and
I'm wondering if I'm able to easily unlock it so I can use it with my
existing Vodafone SIM.

A few searches on google for the normal model seem to point to me
having to get it done at an 'unlocking shop' but I'm wondering if I
can do it without involving one?

Thanks for your help,
--Nick.
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