Apple will give up to $100 extra when you trade your old iPhone for an iPhone XS, XR
On top of the original trade-in value, Apple will add up to $100 in store credit when you turn in an older eligible iPhone.
For a limited time only, Apple will give you up to $100 extra when you trade in your old iPhone and swap it for an iPhone XS or iPhone XR . Potential customers who are considering the latest iPhones should consider this promotion for Apple's trade-in program, known as GiveBack, as an avenue to recycle their old devices while saving on a new one.
As always though, there are caveats. The money comes in the form of an Apple Store Gift Card, and it only applies to a handful of iPhone models: the iPhone 6/6 Plus, the iPhone 6S /6S Plus, the iPhone 7/7 Plus and the iPhone 8 (notice the iPhone SE and iPhone 8 Plus are excluded).
Also, depending on the model, you might not actually get $100. For example, an iPhone 8 will get you $25 of extra credit on top of its trade-in value, while the iPhone 6S will fetch you that full $100.
In addition, the trade-in value you'll get for the XS or XR varies on the condition of your phone. As a reference, Apple has a list of how much you can expect (the iPhone 6 caps at $75, while the iPhone 8 is worth $275), but be prepared to receive less than that if your phone is in less-than-optimal shape.