Switching Customers Get A Free Phone Or Up To $150 Off

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Switching Customers Get A Free Phone Or Up To $150 Off

I am currently a sprint carrier and the other day I saw the Iphone 8 in a boost mobile store and saw a promotion, "Switching Customers Get A Free Phone Or Up To $150 Off" I decided I wanted to switch and buy the phone, I was looking to buy it online. My question is, if is there a way I can apply this $150 off while I am checking out online? Or does it only works in store?