What's the point of unlocking an iphone?

Hi guys so i know people unlock their iphones because they want to change carrier but the locked iphones are sold for 200$ so would it be possible to buy a locked iphone in the us & unlock it in belgium? I mean wouldnt that save like 400$? That seems like an impossibly good deal but maybe i don't really get what a locked iphone is.

I don't know much about Iphones, but all touch screen phones lock, not just Iphones. So far, I think Iphones are the only phones to password-lock. My touch screen phone locks without a pass and there's no way to set up one, either. An Iphone has more capability than just a normal phone with a touch screen, that's the reason for the password.
For every touch screen phone in the world, they lock because they're touch screen. It prevents them from calling someone in your pocket or when you sit on your phone.

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