I followed the step by step process to install Cyndia and icy in my iphone 3g 3.0

I want to unlock it for other networks....

when I type: ultrasn0w.com...
it says


"Did not find repository" The indicated repository couldnot be found. this could be because you are trying to add a legacy Installer repository (these are not supported). Also, this interference is only capable of working with exact repository URLs. If you host a repository and are having issues please contact the author of Cyndia with any questions you have...

Please Help