Unlock LG Mobile phone

Question

IMEI: 355525-00-199356-4
sn: 501KCJZ199356-OPT-P16
CC1100GO

I have an older style LG mobile phone which is locked to Optus, I am with prepaid vodaphone now & on the w.e my good mobile got wet, I want to use this one as a spare phone until I buy another mobile. Is there any unlock codes you can provide me with? I am in Australia. I think this is an LG CC100 Many Thanks Jodie
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