How to know whether my iphone is unlocked factory or not?

How can i know whether my iphone is unlocked factory or not?

You're iPhone is not factory unlocked

Put a SIM card in it from like tmobile and if it says tmobile in the left hand corner than its unlocked.

You can check it here, http://trustediphoneunlocker.com/pages/free-iphone-imei-checker.html

Try putting at least 2 sim cards in it and if they work on both carriers, then it is unlocked.

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