As we all know by now, mobile phone use is skyrocketing.  In Columbia, for example, there are more mobile subscribers per 100 inhabitants than in the US (92 vs 87 as of 2008 data)! And in Africa, about 40% of the population owns a mobile phone –  from essentially zero ownership 10 years ago. 

There is a lot of talk these days about "mHealth", but there's another way that mobiles are affecting health: as a labor-saving device.