T-Mobile offers Eligible Existing Customers of 2+ Years: Up to $350 in Bill Credits divided up and applied over 24 months towards an eligible Apple iPhone Smartphone (11, 11 Pro, 11 Pro Max, XS, XS Max or XR) when purchased via 24-month Equipment Installment Plan on a postpaid plan when you Trade-In an Eligible Apple iPhone Smartphone (6, 6+, 6S, 6S+) and mention promo code T298 ("2020 Apple Trade Promo 10") via Customer Service Phone Call or Online Chat. Thanks silverplasticware Note, eligible iPhone 6 series smartphone must be in good/working condition to receive full credit. Must be on an Equipment Installment Plan (EIP) on a qualifying line of service. iPhone 6 series smartphones which have not been active on your account for at least 2 years may not be eligible for trade-in. If you cancel wireless service, credits may stop & remaining balance on required finance agreement may be due. Eligible Smartphone Trade-In (In Good Condition; trade-in may not be eligible if smartphone has not been active on your account for at least 2 years)Receive $350 total in Bill Credits applied over 24 months when you trade one of the following eligible devices:iPhone 6iPhone 6+iPhone 6SiPhone 6S+ Trade-In Credit from above are valid towards:iPhone XR 64GBiPhone XS 64GBiPhone XS Max 64GBiPhone 11 64GBiPhone 11 Pro 64GBiPhone 11 Pro Max 64GB