I would assume both jailbreaking for 3rd party software and carrier unlock.
It's true in the case of most Windows Mobile phones: application [security] unlocking the phone (not carrier unlock) constitutes a violation of the manufacturer's warranty. So I would imagine the same is true here.
The Apple Warranty clearly states that you have to have AT&T service (assuming the iPhone data plan) to be covered. They can check for the iPhone plan with one call to CS. I am very sure on that.
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I would assume both jailbreaking for 3rd party software and carrier unlock.
It's true in the case of most Windows Mobile phones: application [security] unlocking the phone (not carrier unlock) constitutes a violation of the manufacturer's warranty. So I would imagine the same is true here.
The Apple Warranty clearly states that you have to have AT&T service (assuming the iPhone data plan) to be covered. They can check for the iPhone plan with one call to CS. I am very sure on that.