Device payment purchase w/new or upgrade smartphone line on Unlimited Ultimate plan req'd. Less $1,100 trade-in/promo credit applied over 36 mos.; promo credit ends if eligibility req’s are no longer met; 0% APR. For upgrades, trade-in phone must be active on account for 60 days prior to new device purchase. Trade-in must be from Apple, Google, Motorola or Samsung; trade-in terms apply.