Had problem after updating 9.2version application are not working and not even updating and installing from Apple Store and even phone is not updating to 9.3version
RRegarding phone functions
iPhone 5s, iOS 7.1.1
Any restrictions set up in Settings/General/Restrictions? If yes, disable them and try again.
Did you try to update using iTunes on the computer?
Use iTunes to restore your iOS device to factory settings - Apple Support