Phone Unlocking network unlock for code x8 sony ericsson please

[gsim]

hi guys i am looking for a code for my friend. he needs an network unlock code for his sony erricsson x8 phone on 02 network.

dose anyone know any sites or way i can get it for free? or bests sites to buy it and it will work.

he's been told £25 from phone shop to do it.

any help would be good.

thanks gsim