Traders
I read Trade in the old model and buy the new model. It’s can trade old model iPad and buy the new Apple Watch?
or
Trade old Apple Watch and buy the new Apple Watch?
iPad Air 3 Wi-Fi
I read Trade in the old model and buy the new model. It’s can trade old model iPad and buy the new Apple Watch?
or
Trade old Apple Watch and buy the new Apple Watch?
iPad Air 3 Wi-Fi
There is in-depth information about how trade-in works in the FAQ section of this Apple article:
Traders