Prepare Before You Install iOS 9.0.2
The iOS 9.0.2 update is small but if you install it without any prep work, you might come out of the installation process with problems.
We always recommend taking some steps to prepare for an iOS update. Big or small. iOS 9.0.2 is a small update but it could have a huge impact on your device's performance. You'll want to take some precautions before you install.
We've put together a guide that will take you through the process. Follow the steps and you should come out of the iOS 9.0.2 upgrade unscathed.