What is apple complimentary support?

So I bought a iphone 5S about two months ago and the phone keeps freezing off every often thinking of taking it to apple and see what they do about it. I ran my imei on apple support and it's says I'm still eligible for apple "complimentary telephone technical support for the first 90 days" what's the complimentary technical support means does any one know? I'm guessing during the 90 days you can just go and get the phone replaced without any question. Does any one know? I woud really appreciate it.

They will replace it for free if it wasn't jailbroke and there's no damage that you caused.

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