After your new iPhone has been completed with setup wizard, the contacts added, and also the emails which come though, you have to learn also the ways for downloading the app from the app stores. Those are truly recommended to learn especially for those who are at the first time using iPhone. Yet, there is also extra information that you have to know about iOS 9. That additional information will be explained more as follow.
iOS 9 User Guide
Learn more about iOS 8 (iPhone 6 & iPhone 6 Plus) click here