I also found the inaccuracy of the chart awful and looked into producing a correctly scaled version:
The main problem was being able to still display readable text, which should lead to using another way of visualising the data instead of leading to using an incorrect graphic.
I also looked into using a stacked bar chart to display the information, more information (and code for generating plot, though I didn't put too much time into making it look pretty) here: http://www.actuarially.co.uk/post/27156208823/smartphone-ope...