O functionality / application a iOS whereof Apple said nothing, not promoted in any way, and that I know very few users iPhone, It is "Magnifier"
Magnifying glass we help enlarge the image with the help camera from the iPhone, is introduced with iOS 10But most of the users who needed something, they were oriented specific applications from the App Store, Knowing that the iPhone already has this application.
A good application for "digital magnifier", It is BigMagnify. This application uses iPhone camera and greatly magnifies the image, helping us see hard-to-see details with the naked eye. It is particularly useful for those who have visual problems and have to read a tiny writing.
BigMagnify zooms to the 8xIt has the option to lock / image capture, starting torch / flashlight, switch main camera and front camera (ideal if you want to analyze pores on the face) autofocus si image stabilization.
The application is available on Apple App Store in both a free and paid version (no ads).
You can download the application from the App Store. Searching for "BigMagnify"
If you do not want to keep your space in the iPhone with the above application or the like, you can activate the iOS zoom function,
All you have to do ones is to go in Settings > General > Accessibility > Magnifier and set "On"
Close the "Settings"then press three times quickly on the "Home" to start Magnifier application iPhone.
Magnifier iPhone app has something fewer options than previously presented, but it is enough to help us read a very small writing from various labels and see details with zoom 10x directly on your iPhone.