It's 'legal' to jailbreak - that means you can jb and download non-apple apps for your iPhone. This might explain: http://blog.iphone-dev.org/post/8621...f-jail-is-free

As far as unlock [to use on non-AT&T network] for 4 iOS, Team Dev still working on it. Sign up for twitter, follow @iphone_dev for the latest info.