Sony Ericsson s302 nck not allowed?

I got unlock key for sony ericsson s302 and when i try tu unlock it it says nck not allowed,how can i allow that nck,or something,pls help...

I suggest you can approach Mobileunlocksolutions.com and specify the country,locked network of Sony Ericsson S302 .Based on the availability you can get the permanent unlock service and for free unlock instructions visit Mobileunlockguide.com