It's really important that you take time to notice and select the main features for your description of a graph, chart or diagram.
Look at the table above and a student's summary of main features below.
Overall, it can be seen that the people who used mobile phones for making calls were at the top in all three years. However, it is noticeable that there is no record of Internet usage and video recording in 2006.
I told the student that I thought she had missed some of the key features shown in the table. What main features can you see if you look more carefully?