Apple threw IOS 9 the last September offer a new interface and some functionality which has been improved or added. Such as Siri that bend over backwards to serve you.
More Autonomy
With the new iOS9, you will be able to save some energy when your phone is coming close to 20% of battery. To active the economic mode, open “Setting” and open the new option “Battery”. You can now active “low Power Mode” which will automatically be set off once the threshold of 20% is attained.
Quick listening
After connect your headphone to your phone, an icon will coming up to the left to the lock screen. The new short-cut bring you to the last app music/audio used (iTunes, Podcast, etc).
Attached annex in your email
Touch twice in your message, then add an attachment or/and Photo.
Ask Siri to find some Photos
Take notes
In Safari and other apps, you can save a relative note about the page that you are consulting without leaving the app. Touch 
and select Note.
Use the classic version of a website:
A faster access, you just have to touch and stay on the arrow. 
You will be able to choose the option “Request Desktop Site” and go the main version of the website.
Safari saves to PDF:
You can keep a webpage in iBooks. Just touch and select the iBooks icon. You will be able to find the page as PDF in your iBooks app.
