One, the simplest way is to restart the phone so that generally can solve your problem, if not look at the following method.
Second, exit the App Store account, we click on the iphone after the exit and then login, try to see can solve the problem.
Third, restore the network settings, (set-general---"restore") and then try to download.
If it's still not working, we can use the computer to download, use itunes to download the software application you need.
If the computer can download that is estimated to be your network problem, if the computer and mobile phone in the same network that computer can not download we could restart the router to try.
attached: no App Store
Set-general----access restrictions---You can open the app icon by installing the application.
Second, access restrictions inside open installation applications, delete applications and so on, or directly off the access restrictions.