Is it safe to buy a iPhone from a third-party seller on amazon?

I want to buy a new iPhone on amazon from a third-party seller, but i'm a little anxious about. Should i buy it?

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Whenever you buy stuff from the internet you just have to take your chances + you should see if the seller has a high rate of trust (above 90% usually is good) i buy from e-bay and everytime i do i have this feeling. I don't know about amazon. I guess you'll have to see but you should first buy something smaller to see how the "system" works.

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