Are iPhone 5s internationally unlocked?

I'm planning to buy a iPhone 5s locked to either t-mobile, verizon, sprint, at&t which one of these will work in any country internationaly. I'm in Sri Lanka. Will they work on any network. All answers are welcome thanks.

If on contract they will be locked

Phones can't be bought from verizon, sprint, at&t if you don't live in the US, You can try T-Mobile though. Only GSM phones work worldwide

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