Can you use iPhone internationally?

So I want to buy new iPhone 5, the one that comes with the contract and i want to use this iPhone in some other country than US, is that legal? I mean i want to use this iPhone and use other mobile service in country such as Kazakhstan. So can I use the iPhone that cost 300 in the other country or i should buy the one that cost 900?

Not unless it registered in another country

Usually iPhones are locked to your network, you'll need to contact your telecommunications provider (verizon, tbmobile, at&t, etc) and have then unlock it, I think it does cost to unlock though, else you want be able to use your phone internationally

If you use a GSM phone (T-Mobile or AT&T) then you will just have to buy the SIM card for the country you're visiting and then you will be able to make/receive calls, use apps, get email, etc all as if you were using it on your original network.

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