Make sure you are working on the Phone Base layer and invert the selection again, so its only surrounding the shape.Hit CTRL+Shift+J (for PCs) or from the Layer Menu > New Layer > Via Cut. This removes the selection from the body of the phone, leaving a heart shaped hole. Name the new layer Screen Base.Reselect the shape on the new layer by CTRL+Clicking (for PCs) the layer thumbnail. From the Select Menu, go to Modify > Expand. Again, the amount is relative to the size of the image. It should be a few pixels larger than the original so I used 10 in this example.Move this layer down so that its underneath the Phone Base layer. Select a suitable color for an LCD screen (in this case I used Light Pea Green from the colour swatches). On the Edit Menu, choose Fill, set the Contents to Foreground Color, Mode: Normal, Opacity: 100%. Then click OK and you should have a nice green heart.With the shape still selected, select the Phone Body layer, click CTRL+J (for PCs) or Layers > New > Via Copy. Name the new layer Bezel. Well come back to this later.We will also need a couple of duplicates of the screen layer, so drag the Screen Base layer onto the New Layer icon a couple of times and rename them Screen Middle and Screen Top.Your layer palette should look something like the picture above.Youll notice that the screen looks too plain and flat, well sort that out.Hide the Screen Top and Screen Middle layers and select Screen Base. From the Filter Menu, select Noise > Add Noise. Change the settings to match those above, it will give it the grainy LCD look.