What is the trade in value for my iPhone XR 64GB?

Well, it saves you from having to find a buyer. Read this article (FAQ section included, at the bottom): -> Apple Trade In - Apple

Nobody forces you to use this method, let's say it's an opportunity offered by Apple.

If you're not happy with it, try selling your iPhone on your own, then add the money to buy a new model.

Regards

Giulio

Are you asking why should you use the Apple Trade-in process OR what that process will assess what your iPhone XR is worth? If it is the latter, then you can find out yourself by just using the process. To get it started, simply go through the steps to order a new iPhone. One of the first steps will ask you if you have a phone to trade in. Follow the steps by answering a few simple questions about your current phone. The end result will be a pre-evaluation price. You are under no obligation to either trade your phone in or purchase the new one at this point.