T-Mobile in January offered $600 off when trading in iPhone 8, and $800 off for newer models. I received iPhone 13 in the mail, sent back 8, paid $80-90 up fron

T-Mobile in January offered $600 off when trading in iPhone 8, and $800 off for newer models. I received iPhone 13 in the mail, sent back 8, paid $80-90 up front for taxes and fees, and am paying $6.67 a month for 30 months after which I will own 13 free and clear.