Can I buy a phone from Sprint online website and add it to my plan?

I have a samsung s7 and i wanted to get an iphone 6s (I know it's a big jump but i really like that phone). I wanted to know if i could buy an iphone from like Amazon or ebay and just add it to my plan because i heard that you couldn't do it with sprint. So i wanted to know would sprint let me add a phone that i didnt buy from them

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