Unlock code are alphanumeric, when enter you must differentiate uppercase and lowercase letters.
Sample of Code:
353463050726150 NCK: 920SOIkSLbJNMZFTQ8z31ETV
353467051794307 NCK: gK92l5NsbaKxf23e3eMBFC9B
358674042527606 NCK: tED4LeQwV4gLNJfacJKab5CI
How to enter NCK code?
1. Turn ON the phone with original SIM Card
2. Type *#*#4669#*#*
3. Select SIM
4. Enter your NCK code in proper like shown in the software
5. Unit will reboot, then your done...
How to Enter Unlock Codes on SHARP phones.
1. Type *#*#4669#*#*
2. Select first menu item
3. Enter unlock code. Phone will be rebooted
4. Insert ORIGINAL or test SIM Card.
5. Phone will be unlocked after this operation