Pretty much buying a full priced new iPhone X and get a $75 Amazon gift card. Phone can be unlocked as soon as it's activated I believe.
Amazon.com Gift Card Promotion: Offer valid 12/01/2017 – 12/07/2017, while supplies last. Req. iPhone purchase and activation on Inner Circle plan by 01/15/2018. After activation, acct. must remain active & in good standing for 14 days. Amazon.com Gift Card Claim Code will be sent 2-4 weeks after activation to those customers retaining qualifying service. Virgin Mobile is not responsible for misdirected email. No substitutions, cash back or rain checks. One Gift Card per household. Virgin Mobile reserves the right to change or cancel this offer at any time.
Virgin Mobile's iPhone X is A1865, the same as Verizon's. It's the CDMA version which is the global one.