5 things you didn't know your iPhone could do
Even though we use our iPhones all day every day, there are still a handful of features that are relatively unknown.
Some of these features are buried in the Settings menu while others are hidden in plain sight.
Plus, there are a few things Siri can do for you that you may not know about.
(Note: Most of these features are available in iOS 8 and higher, while some are available in iOS 9 and higher.)
Respond to texts without unlocking your phone.
You can respond to texts directly from your lock screen by pulling down on the notification drawer and swiping over to the left on the text notification. You'll see a "Reply" option, and tapping it will let you type a response without having to unlock your iPhone.
Respond to texts while you're in an app.
If you're in an app, you can swipe down from the top and access the notification drawer to answer a text the same way you would on the lock screen.
See which apps drain the most battery.
Want to know why your iPhone battery is draining faster than usual? Head over to Settings > Battery. This will tell you which apps are occupying the most battery power.
View every photo someone has texted you, and vice versa
There's an easy way to view every photo and video you've sent someone. Just open the messaging thread in the "Messages" app and press the "Details" button in the upper right corner.
Source : http://www.businessinsider.com/iphone-tips-tricks-and-hidden-features-you-didnt-know-about