Will this iPhone 5 work or will I have to unlock it?

My Dad currently has a plan with Three Ireland, those of you who don't know who they are they're a Phone Company in Ireland http://shop.three.ie/catalogue/products/iphone

Anyway he has had an iPhone 4 contract with them for almost 2 years where he pays 40 Euro a month, and soon that contract will end. He is then going to be allowed upgrade to the iPhone 5 for free and is allowed keep his old phone. As he is happy with the iPhone 4 he has now he said if it is possible I can get the iPhone 5 when his update comes out.

Is this possible? Will I have to unlock it and bring it somewhere where they will put my sim in? I'm not on bill pay I'm just on prepay where I top up my phone when I need to and that's the way I want to keep it. But will this work?

Sorry I'm all new to this!

Unlocking a phone just means you're making it so it will accept the SIM from any carrier. If you're happy to use the same carrier that your father does than all you have to do is buy a SIM card from them, activate it with a plan and number, then put it into the iPhone and it'll work.

Yes you can use the phone,

If it's locked to Three and you want to use it on a different network then yes you will need to get it unlocked, but wait till the phone arrives they are not always locked.

It won't matter if you have a pre-pay or contract SIM card.

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