If you can't install an app on your mobile phone, there may be several causes of the problem.
To install apps, there needs to be enough memory.
Solution: Uninstall apps
Some apps aren't available in all countries or they're made available at different times.
Solution: Install apps from App Store
The payment information used when buying apps is connected to your Apple ID. If the information is incorrect, it needs to be updated before you can buy apps.
Solution: Log on to App Store from a computer and update your payment information.
To install apps, your Apple ID needs to be activated on your mobile phone.