What is the place called inside where they repair phone screens? & where they sell phone cases?

It’s Called Cellairis.

From an associate: Walmart doesn't fix phones, but the store "Cellairis" inside fixes phones.

Electronics Department

Electronics

I don't think there's a place inside where they do this. Try the electronic department

There is no separate electronic department or third party at Walmart. I have seen these stores at Best buy

Don't know if it has a name

Go to the electronic center