50% off any Iphone when you switch to Sprint from T-mobile @Target B&M — w/ Cartwheel coupon

I saw a new coupon on Target’s Cartwheel app (under "Checkout" in the bottom) – you can receive 50% off ANY Iphone when you switch to Sprint from T-Mobile. Unfortunately, if you don’t have T-Mobile, you won’t have access to this deal.
https://cartwheel.target.com/checkout/print