Will an iPhone 6 Plus from USA work in the UK on UK networks?

If my dad was to bring me back an iPhone 6 Plus from America (which is purchased from an Apple Store), will I have any issues using it on the 3 network in the UK? Will it just be as simple as putting my SIM card in and using it on 4G etc?
Hope you can help, thanks!

US bought iPhone 6s at this point would be for carriers, not unlocked like it is available in the UK. Usually that would be the case in late-November. So the better thing would be to order it from the UK Apple Store, or possibly cheaper by ordering it for 3 on a contract

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