The best way to make a slide with a smartphone screenshot:

  • Get a stock image of a smartphone without the device maker brand (using Google Image search might get you into copy right issues)
  • Take the actual screenshot on your smartphone, in my case I use my iPhone browser to go to the web page and press the home and on/off button at the same time. Email yourself the image
  • And here comes the trick: apply a subtle inner shadow to the image. You see the difference in the image below, the left side one looks a little bit bland, the right side looks much more natural