Trade In Question

see this link

https://www.apple.com/shop/trade-in?afid=p238%7Cs4wibFo6O-dc_mtid_1870765e38482_pcrid_378955738061_pgrid_80259604234_&cid=aos-us-kwgo-brand--slid---apple+trade+in-e-product-

contact your nearest Apple store if you have any questions.

Why would you want to do that when new devices are just weeks away?

Currently Apple will not accept an iPhone XR in trade. Wait until the end of next month.