[Q] Can't Network Unlock even with Code

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http://forum.xda-developers.com – I got my unlock code from ATT but I can not seem to find a way to unlock it, either with the ATT sim in or a TMobile one. Previously using methods here on XDA I was able to unlock the SIM lock; the Subset lock; the SP lock and the Corporate lock. Going into Diagnosis all of those locks are disabled. However, the Network lock is still enabled. When I put in the unlock code and excute, I keep getting the message of incorrect password. How can I remove the Network lock??? (HowTos)