I updated to iOS 9.3.2 and now I can't download anything on the App Store. It is always stuck on "loading". I also tried restarting and logging out my Apple ID and it doesn't help at all. I have a stable connection and my brother has an Android device and he can download smoothly so I'm sure that it's not a connection problem and I think the problem here is the new OS update.
Make sure your iTunes is up to date on your computer beforehand. The update itself hasn't caused a problem on my iPhone 5s so it may be something to do with your phone.