I can't use one of my apps
If you can't use an app on your mobile phone, follow these instructions to solve the problem.
Solution: Installing and using apps from App Store
Solution: Restarting my mobile phone
Solution: Check App Store if there's an update for your app.
Solution: Installing and using apps from App Store
Solution: Installing and using apps from App Store
Solution: Ending active applications on my mobile phone
Solution: Using my internet browser