If there is one metric that the mobile industry reveres it is Average Revenue Per User (ARPU). It’s always foxed me why this should be a meaningful measure. After all, mobile markets started with relatively few international business customers at exorbitant tariffs, so as the market moved to more and more of the general population using mobile, ARPU was bound to fall as people paying with their own hard earned cash are likely to be more price conscious. So ARPU is bound to fall where the uptake...