You have to meet the unlocking requirements first.
If you want an unlocked iPhone, the best way to get one is to buy it directly from Apple.
DO NOT buy from a retailer like Best Buy. Their phones are provisioned with the Apple Reseller Flex Policy and will lock themselves to the first SIM used.
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I Concur and suggest you buy unlocked directly from Apple. This will save you all kinds of time and hassle later and you won't have to meet any requirements.