On iOS devices:


1. Press the power key and the Home button at the same time


2. Hold down the two buttons and release them after a few seconds


3. Open your camera photo album, screenshots will be automatically saved there



On Android devices:


1. Press the power button and decrease the volume key at the same time


2. Hold down the two buttons and release them after a few seconds


3. Open your photo gallery, screenshots will be automatically saved there