What service provider is iPhone when bought in Apple store in US?
When someone buys an iPhone from Apple in the US, is it locked to a certain mobile service provider such as AT&T or is it unlocked for any service provider?
I have a relative going to US from the UK and so there would be no point in buying an iPhone there if they are locked.
Thanks
Added (1). I have just had a look on the Apple US website (i'm from UK), and when you go to select for instance an iPhone 5, apple then directs you to select a Carrier such as AT&T etc. How would I get an unlocked iPhone 5? And where would I get it (apple store, or apple online).
Added (2). There are two comments below this -
The first saying that there are unlocked iPhone 5's on the Apple store US,
The second saying that the only unlocked iPhone 5's is on the Apple store UK.