iOS 9 Delivers a Smarter iPhone
With iOS 9 your iPhone learns your habits so that it can react to specific tasks and activities. This can be as simple as starting up a running playlist when you plug-in headphones early in the morning and playing your audiobook in the car in the evening.
The smarter iPhone with iOS 9 will also remind you to add people to your event or email so you don't forget someone, let you know when you need to leave by and iOS 9 can even create an event on your calendar based on an email you receive.
If you use Mail on the iPhone and get a call from an unknown number, the iPhone will attempt to search your email for that number and let you know who might be calling you so you know if you should pick up or let it go to voicemail.