Urgent Sim Unlock help?

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http://forum.xda-developers.com – Hey guys before I had 2.3 and I had used an SGS unlocker off the market store to extract my nv_data.bin, I then used the samsung tool unlock code generator, when I used this I remember it unlocking my phone. I'm now running a custom JB rom and my network isn't working at all and when I search for it, it says "error while searching for network" I tried using the same method as last time to do it, i deleted my old nv_data and its just erroring in the samsung unlock tool. It's not asking for an unlock code or anything either What can I do guys http://forum.xda-developers.com/show....ph (HowTos)