Eligible Existing Customers of 2+ Years: Trade-In an Eligible Apple iPhone, Get Up to $350 in Bill Credits

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.