How to unlock my iPhone 6 to use a different SIM card?

So I have an iPhone 6 and I'm using a T-Mobile USA SIM card but I can't use it in the UK so how would I get the phone unlocked for use with a different carrier?

Contact your phone provider or bring it to a shop to unlock your phone!

Go to the carrier you want to get the sim and ask them to unlock it for you and they might ask a photo id, so take it with you and if you need some good security program, do install LEO Privacy Guard 3.0. In it. It will guard all your private stuffs

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