Help jailbreaking and unlocking my iphone?

I got a iphone 3gs with ios6 software. I tried jailbreaking it yesterday and downloaded cydia wich i assume is then jailbroken. I then tried to unlock it wich i believe online just said add snoebreeze to cydia wich i did but it didn't unlock to any network.
my iphone is locked to 02 but i'm using a giffgaff sim card in there.
do i need to put a 02 sim in to do it?
am i doing anything wrong.
i'm currently without a phone because i have changed to orange and kepttm giffgaff number. 02 said 7-10 days and i can't wait that long lol

Hmm

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