Receive up to $500 promo credit ($180 w/Welcome Unlimited, $360 w/ 5G Start, or $500 w/5G Do More, 5G Play More, 5G Get More or One Unlimited for iPhone plan (Welcome Unlimited and One Unlimited for iPhone plans can't be mixed w/other Unlimited plans; all lines on the account req'd on respective plans)) when you add a new smartphone line with your own 4G/5G smartphone on an eligible postpaid plan between 12/23/22 and 2/16/23. Promo credit applied over 36 months; promo credits end if eligibility requirements are no longer met. Excludes Verizon Prepaid plans.
Typically Verizon will have you cancel your current pre-order and place a new order. They're not fond of making changing to an already placed order. You can call but I suspect that this will be what they advise you to do. Good luck.