App store on iOS won't show the ratings and the rewievs
The problem might be the change of store.
Smaller stores don't have enough reviews to show. Look for a very popular app (Facebook, Snapchat) and you may see reviews, but even then, it may happen that there are not enough reviews for the current version. You can switch to see the reviews for all versions, that may have enough data to be shown.

Or you can switch stores; to do that, go to Settings > iTunes &amp; App Store > Apple ID, enter your password, and tap on Country / Region to Chang your store back to the U.S.

If you have iTunes Match or Apple Music subscriptions running, you'll have to cancel them first.