The 0% financing fine print is as follows:

> Financing available to qualified customers, subject to credit approval and credit limit, and requires you to select Citizens One Apple iPhone Payments or Apple Card Monthly Installments (ACMI) as your payment type at checkout at Apple. In order to buy an iPhone with ACMI, you must select one of the following carriers (but you cannot use a prepaid carrier plan): AT&T, T-Mobile, or Verizon. An iPhone purchased with ACMI is always unlocked, so you can switch carriers at any time, subject to your carrier’s terms.