sony ericsson phones cannot be unlocked for free except by the carrier.
if you want to unlock your phone you can use a Deluxe SE kit which i sell on terminatordongle.com this will allow you to unlock unlimited sony ericsson phones (most models) OR you can buy a DSC-11 data cable and 1 remote server credit which is sold at http://www.terminatordongle.com/remote
good luck!
--Corey
