They mentioned giving up to $800-$1000 for trade in for an iPhone 12 or newer. That's pretty aggressive on a device that's $999-$1199 list. It sounds like they are really wanting people to upgrade to this device.
It's "Up to $800" for an "iPhone 12 or newer". You won't get more than $200 for trading in an iPhone 12. The max value is reserved for the newest and highest end phones, i.e. 15 Pro Max.
