关于Verizon 的buy&get iphone8 的deal

8月初就要去美帝上学了，这两天研究电话卡的时候发现Verizon有一个But&get iphone8 的deal。粗看了一下感觉要新开卡的话超级合算。感觉是不是自己看漏了什么还是资本主义真的这么真实吗。有买过这个deal的朋友解答一下吗附Verizon 官网的说明
Buy & get iPhone 8 64 GB on us. One new line required.
Up to $1149.99 device payment purchase per device required. 2nd phone of equal or lesser value: less $699.99 promo credit applied to account over 24 mos w/in 1-2 billing cycles; promo credit ends when balance paid or line terminated/transferred; 0% APR. New line of service required.