Will no-contract iPhone 6 for Tmobile work on other GSM phones?

I'm thinking of buying iPhone six with full price, without a contract. I understand that this will be sim locked to T-Mobile. How/when can I get it unlocked from T-Mobile? When I travel internationally not sure how this is gonna work out!

If you buy it full price without a contract it comes unlocked.

Don't buy at Tmobile, Pay full price for unlocked from the Applestore-same price. Then you can use on any network you want. Best luck.

Apparently they are not locked in this case, though in previous instances contract free did not mean unlocked.

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