Unlocking an american iphone for use in ireland?

Hi
My cousin gave me an iphone 4 from america, and i want to use it over here, but what do i have to do to let me use it? And how do i do it? All help appreciated!

To get it unlocked you need to get your cousin, or whoever had the phone originally, and have them contact the carrier that they purchased the phone through and ask them unlock the phone… The only person that can unlock it is the person that bought it… Depending on the carrier, you might have to pay to get it unlocked. Keep in mind that they do not have to unlock it for you if they don't want to. There are no other options… If they do say ok, you need to call us at 1800MyApple and tell the call director that you want to check the status of the unlock. They will transfer you to iOS, the carrier you want to use it with should give you a code, give that to us and we will process the unlock. But we can't do it with out the carriers permission.

What's your Network provider?
You can unlock your iphone4 using Remote unlocking method. Which is the safe and secure method to unlock iphone. You can get this service from http://www.unlock-zone.com/apple-iphone-4/rs16wp9/ here you need to specify your Current Network name, IMEI number of your iphone. Here they unlock your iphone using latest versions of iTunes.

You need to unlock it for you to be able to use it with different carriers. After the iPhone Factory Unlock, you will be able to use it from America's carrier to your local carrier.