The stage of drawing a simple mobile phone in Third Angle Orthographic Projection are outlined below.

1. Draw a faint horizontal base line. The front and side view will be drawn resting on this line. It ensures that these two views are in line and level.

HINT - Draw very faintly using a 2H pencil.

Draw the outline of the front view.

2. Draw a grid very faintly. This will be for the buttons / keys. The lines must be drawn precisely - horizontal and vertical lines must be accurate.

Once the grid is drawn add the buttons.

3. Draw the rectangular liquid crystal display and the circular control.
Draw the large circle using a compass. Smaller circles are best drawn using a circle template.

4. Draw the left / right / up / down keys. These are quite small but they must be drawn precisely.

5. Draw the side view being careful to line up the buttons so that the buttons on the side view are level with those on the front view.

6. Draw a 45 degree line from the top right corner of the front view. Project the thickness of the mobile phone up to the angled line and across the form the outline of the plan view.

7. Add the detail to the plan view (the keys). These can be seen from above as they stick out of the surface.