Legal issues regarding jailbreaking iPhones?

I'm curious about the legal issues surrounding jailbreaking of iPhones. For example, is it illegal to jailbreak an AT&T iPhone to use another service provider? Or install other softwares on the iPhone?
Furthermore what happens if the jailbroken iPhone breaks? Does it violate Apple warrenty?

It can be easy to get "unlocking" and "jailbreaking" confused, but the two terms mean totally different things. Unlocking refers to freeing your phone to work on any carrier instead of just the one you bought it on. Jailbreaking is the process of circumventing Apple's security measures in iOS to install tweaks, hacks, and mods that aren't allowed in the App Store.

A couple of years ago it was decided that jailbreaking is NOT illegal. So no worries there. You can jailbreak any Apple device you wish, they just really don't like it. As for warranty, you can always just restore your phone and wipe it of any hint of a jailbreak and they'll never know, warranty intact

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