1. Upgrade with eligible trade-in: Requires payment of percentage of sales price (50% or 80%); account in good standing; trade-in of financed device (or one of the same make and model) in good physical, and fully functional, condition through the AT&T Next and AT&T Next Every Year trade-in program (excludes AT&T Trade-in program where you receive instant credit or a promotion card for your trade-in); and purchase of new eligible smartphone with qualified wireless service. After upgrade, unbilled installments are waived.