If you are using IOS 9 on your iPhone 6, there are a few things that you can do to keep your device running smoothly. First, make sure that you have updated to the latest version of IOS. This can be done by going to the Apple App Store and searching for “IOS 9.” Once you have installed the update, make sure that you reboot your device. Second, make sure that your battery is fully charged. This will help keep your device running longer and preventing it from shutting down during use. Finally, be sure to keep your device clean. This will help prevent any potential problems from arising and ensuring that your phone is running as smoothly as possible.