T-Mobile US starts smartphone trade-in promotion By October 18, 2018wordpress Read More » SOURCE: The Verge This site is not involved in the creation of this post. Related posts: OnePlus 6T trade-in deal: $300 off at T-Mobile Don’t Wait: GameStop’s Best Ever ‘Xbox One X’ Trade-In Deal Ends Today Apple boosting iPhone trade-in credit with up to an extra $100 when picking up a new XR or XS – 9to5Mac Trade-in deals: Get a $20 bonus on all trades ahead of Apple’s ‘iPhone XS’ and ‘iPhone XC’