I have been trying to unlock my 6620 (from AT&T wireless usa) for 2 months now and nobody can help me get the right codes or even tell me how to use the CRux unlocker.!!! is the MMC+MNC 31038?????????????????? for AT&T wireless?

What do I put for the 3 boxes below the MCC+MNC? I think the first box is "asic 2" and then the next 2 boxes are............???????????????????

HELP!!!!!!

IMEI: 353755000056707

HELP!!!!