To calculate Simlock code is necessary to read the block 120 of permanent memory, where is located the security hash code.
I made this read with Advance Turbo Flasher tool.

As mentioned above the hash is a key of 40chars, Which need to be calculated with bruteforce. That hash is calculated by the sum of [UnknownUnlockcode] and IMEI of the phone.
If you have a PC with a Powerful GPU you can do it yourself with HashCat http://hashcat.net/oclhashcat-plus/, If dont you can pay in a online service of BruteForce Calculation.