Is Iphone unlocked only for 4g?

Hi
I just wanted to know what does it mean that Iphone is unlocked and carrier limited? Is it true that if Iphone is unlocked you can use 4g only with your own carrier(But you can make calls)?
Or if it's unlocked that means you can't even make calls with it either(out of your carrier)?

Added (1). So if it's unlocked, then you can't make calls either?

Unlocked means you are not locked into a specific carrier. Here is a link to explain it better.

An unlocked iPhone works the same as a locked one, except of course it is unlocked, able to work with any GSM carrier in the world. The only difference.

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