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Buy the Boost Mobile iPhone SE (2nd Gen.) for $ 89.99 (phone and $ 40 plan) and use as a great trade-in for a FREE iPhone 14 via Apple.com with service activated with T-Mobile Magenta Max.
Details at https://www.apple.com/shop/buy-iphone/iphone-14. On top of the page, under "Special Carrier Deals", click "See all deals", go to Tmobile tab and change trade-in to iPhone SE (2nd Gen.) and you should be able to see the $ 799 offer with Instant trade-in credit: $ 100 and Bill credits: $ 699.
Boost Mobile iPhone SE (2nd Gen.) deal via