How to enter the unlock code to itunes?

I was mailed the unlock code for my iphone 5s from an unlocking website. They told me to enter the code into itunes but I don't know how.

Most likely, you've just encountered a scam. I may be mistaken, but I've never trusted those sites.

Take a look at this site. "Only your carriers can offer unlocking".

http://support.apple.com/...cale=en_US

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