If I order a factory unlocked iPhone FROM the UK will it work in the US?

I've heard of people in the UK ordering a unlocked phone from the US and it won't work. But If I order a factory unlocked iPhone from the UK (because its cheap) will it work here, in the USA?

An unlocked phone will work with any carrier. It's not dependent on geography.

Works fine either way.

It will work for voice and text.

It may not get 3G or 4G data or MMS. You will have to check if the phone frequencies match the carrier.

It won't work with Verizon, Sprint or US Cellular or any mnvo operators using these carriers.

The warranty will only be good in the UK unless the phone specifically had an international warranty. You will also need a plug adapter for the charger.

  • Will the factory unlocked iphone 4 work with any carriers? I want to take this phone to a different country. If i get a sim card there, will the iphone 4 still work if it has been factory unlocked?
  • Will my factory unlocked ATnT iphone 4 not work for tmobile after ios7? I have a factory unlocked ATnT iphone 4. I currently use it for tmobile. I was wondering if I update it to the ios7, will my phone still function the same as before, or would it get rid of the unlock feature and no longer work with tmobile?
  • Will imessage work on factory unlocked iPhone 4? I recently ordered a factory unlocked iPhone 4 for T-Mobile, I was told it does work by a lot of people but then I read it doesn't sometimes? Which one is it… Does anyone know?
  • Will an unlocked iphone 4S work for tmobile if it isn't factory unlocked? I want to get an iPhone 4S and my friend has the iPhone 4 unlocked but i'm worried that if i get it non-factory unlocked it won't work. My uncle tried to do it a couple of months ago and apple said that if it was factory unlocked every time the phone shut off or died it would reset. I was just wondering if the same thing would happen if it wasn't factory unlocked? So if I get it unlocked everytime it will shut off it will reset? That is what i'm worried about.