As far as I know, you can jailbreak anything below iOS 5 from jailbreakme.com (jailbreaking is legal, so I am allowed to give the link here).
So, one way to go would be to downgrade the iOS using iTune to below 5, and then use the jailbreak.
Now, keep in mind, jailbreaking is not exactly the same as unlocking the network, but it will get you toward there. I think the site has info about how to do that as well.
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- The days of playing for honorable defeat is over.
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