How to unblocked my iphone 3G

hi there, i bought my iphone from my telephone compagny in Canada but the fact i travel often to usa i made my mind to buy a sim card usa in order to be able to use for phone in usa, someone is telling me first i need to unblocked my iphone
how i do it

ONLY the carrier to which it is locked can unlock it.
You would have to ask your carrier if they offer this service.

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