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Unlocking a network for Sony Ericsson K800i

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I have a Sony Ericsson K800i and Vodafone is my network. I got a new SIM card that's O2 and it says to insert the correct SIM card and my mom told me to unlock or unblock the network so it would work but I don't really know how too .. I know my IMEI code if I need that but I don't know how to get the unlock code. I'd like quite a specific answer not just to surf the internet or go to any unlocking website because I've been doing that for about an hour and a half and have got nowhere. If you have any specific websites or numbers to call please share them =)