It looks like the folks over at CDG have been digging into the effectiveness of cell-phone based surveys in poor countries.  We have used a couple of these platforms including the one used in their study (Voto).  Bottom Line Up Front: It looks like this works better than most of us thought.

Read their full blog on using mobile phone surveys. 

Mobile Penetration Rate versus Sample and Population Difference 

Source: The same CGD blog…