IPhone 5S App Downloading Problem?

Whenever I try to download an app from the Apple Appstore, I press the install button, it loads for a while, then it stops. The app is not installed and no changes are made. What has happened?

Even though your phone has its own mobile Wi-Fi try to connect to Wi-Fi then download

Call apple itunes 1-800-275-2273

Has this been solved. I just got a refurbbed 5S and have the same problem in the first message. I always use Wi-Fi. Makes no difference. I still have apps downloading since yesterday afternoon. Of course they are never going to download.