USA iPhone 6 or 6 Plus to work in UK and Spain?

I would like to buy a iphone 6 or 6 Plus whan i travel to the USA in a couple of weeks. I don't need it to work on LTE but i would need it to work on 3G! Where could i buy a Sim free phone that would take a sim card from anywhere in the world and work on 3G.

Is it simply go to Apple and buy one. I'm confused as there seems to be a lot about them not working on LTE. But like i said LTE is not important as i would be happy with 3G

Please advise

In a couple weeks you won't get one anywhere as they are all sold out.

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