Samsung Z400 free Full Unlock
Doing the reset (1st temp) you will lose all your information ie contacts, messages, photos, videos etc etc so back them up on your PC first.
1st temp. put this number in the keypad
*2767*3855# let it reboot(restart)
Once it has rebooted enter:
*7465625*638*00000000*00000000#
NEXT ENTER
#7465625*638*00000000#
AND THEN *#7465625# to check the locks....all locks are inactive...these are all the locks...
network lock - inactive
subset lock - inactive
Sp lock - inactive
Cp lock - inactive
Sim lock - inactive
active lock - inactive
phone lock - inactive
auto network - inactive
auto subset lock - inactive
auto Sp lock - inactive
auto Cp lock - inactive
auto Sim lock - inactive