Should I buy an iPhone 6 plus from amazon?

I really want to buy an 64gb space gray verizon iphone 6 plus from amazon. I detasseled this summer so I finally have enough money to buy one all with my own money. I was wondering if it's safe to buy from sellers from amazon. I was also wondering if it could be activated with selectelwireless.com

You should if you're looking for faster net speed and if the i phone 6 you're wanting to buy is more new than used.