1. put non accepted sim card to phone
2. make full eprom reset (*2767*3855#)
3. enter this code to change the nck code to (00000000)
(*7465625*638*00000000*00000000#) enter
4. to permanently unlock the phone enter this code
5. check the phone lock status (*#7465625#)
Your phone now is permanently unlock.....

if this doesnt work, you need a gadget to unlock this phone

See More: samsung e250v unlocking