Method 1: Press the button combination on the iPhone6s
With this method, there is no need to install additional applications or use special mobile accessories to save a screenshot on your iPhone6. All you need is a trick so you can make screenshots using the buttons on the same device:
Show what you want to capture on the screen of your iPhone6.
simultaneously pressed the "Home" button and the "Power" button. (The Power button has moved to the top of the right side in the new iPhone)
The screen will flash and you can hear the sound of the camera shutter. You can find the captured image in the camera folder.