A quick note because this is important.
iOS 9, the latest update to Apple’s mobile operating system, is not a sterling release. There are many reports of the upgrade process freezing iPhones and iPads. My update went smoothly but afterwards I noticed many problems. The most annoying being inconsistent data connections resulting in email and text not sending and apps not updating content. Also many apps are crashing and shutting down unexpectedly.
It you had not upgraded already I strongly suggest you wait for the next release, iOS 9.1. I’m sure it will be released soon.
If you have upgraded and are experiencing some problems here is a link that may help with some of the problems.
Most importantly, make sure you backup your iPhone or iPad before updating. When the update fails the only fix may be to reset your device and restore from a backup.
Alternately, if you’ve noticed some new feature that you don’t like here is a link that might help.