How do I unlock my Iphone 4 to use in Italy?

I am traveling to Italy soon, and I am "unlocking" my phone from ATT. Is there anything else I need to do, or can I just purchase a pre-paid sim card (for example from TIM) and use my phone as normal? Does my phone need to be jailbroken or anyother actions to make it work?

If AT&T is unlocking it for you, then no.   Once unlocked it will accept sims for any carrier.
If you unlock it by any other means such as jailbreaking then you void  your warranty, and will not get assistance from these forums or Apple.

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