How to save screenshot image of your iPhone, iPad or iPod touch screen.
You do not have any screen capture app available for your iOS or Mac computer’s polity, your iOS device, and in fact, you do not need one because your device has a screen capture functionality built in right.
Print screen for your iPhone, iPad and iPod Touch
To save a screenshot of your mobile screen, press and hold the Home button, which is located on the bottom hub of the device (you often use this button to exit the app and return to the home screen).
When the Home button is down, press the sleep (or wake) button located on the opposite side of the phone. The screen will be transitory, you will also hear a click sound and the contents of the current screen will be saved as a new image in your photo gallery.
Related posts: How to use sleep and home buttons in iOS
Remember that if you press the Sleep / Wake button and Home button at the same time for at least 10 seconds and hold it, the same key combination will reset your iPhone.