Why does it say unable to download App?

Related questions

1. Why can I not download apps on my iPhone?
2. Why is my download failing?
3. Can iPhone install APK?
4. Why arent my apps downloading Samsung?
5. What is 3rd party app?
6. Why cant I download apps on my iPhone because of billing?
7. Is it safe to download TweakBox?
8. Are 3rd party apps safe?

Tags

1. #automatically
2. #store
3. #error
4. #settings
5. #again
6. #message
7. #apple
8. #itunes
9. #restart
10. #device
11. #download