Verizon is offering the 32GB iPhone 6s for $5 per month for 24 months, or the 128GB iPhone 6s for $10 per month for 24 months online only. No trade-in required, but the offer is for new lines only.
The fine print: “$349.99 device payment purchase and new line of service required. Less $229.99 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.”