would this really work to unlock 3g iphone?

I found thеѕе sites οn thе web, i hаνе thе nеw iphone 3g аnd i need tο υѕе іt wіth οthеr carrier (nοt аt&t). Thanks

http://iphoneunlock3g.net/

http://www.unlocksiphone.com/index.html