The customer's phone screen has a yellow tint and pictures appear yellowish.

Yes, there's a setting on the phone. If you want to turn it off, you can go into your settings. And then go to display. It's called night light. You turn it off.

Yes, you should come down to the store.

Well, if you can come into the store, we can check to see exactly what's making your phone yellow. Is it fixable or is it something that's damaged? We won't know until we actually see the phone in our hands to see if it's fixed.