Open the app you want to screenshot and go to the exact screen you want to capture.
Press and hold the Power button on the right side and click the Home button at the exact same time.
(This helps to ensure you don’t activate Touch ID or Siri by accident while trying to take your screenshot.)
Is there another way to screenshot on iPhone?
“You can take a screenshot without the assistive touch menu appearing. First you press the white button and the button on the right should say device. Click device. Then it takes you to another menu, press the ‘more’ button and then there should be a button saying ‘screenshot’.
Why is my phone not Screenshotting?
Force restart iPhone/iPad. To fix iOS 10/11/12 screenshot bug, you can also force restart your iPhone/iPad by pressing and holding the Home button and the Power button for at least 10 seconds to have a try. After the device being restarted, you can take a screenshot as usual.
Why did my screenshot stop working?
Force reboot your iPhone or iPad. Press and hold the Home and Power buttons together for at least 10 seconds, and your device should proceed to force a reboot.
Photo in the article by “Flickr” http://www.flickr.com/photos/65265630@N03/9814355725