Dear Robert, cannot agree more. Content and usability will be key next to language and the adaptation to the local context. In this regard a user-centered design approach is particular important (http://ict4d.at/2008/08/13/a-user-centered-design-approach-for-ict4d/) What do you think of an approach for interactive voice response (http://en.wikipedia.org/wiki/Interactive_voice_response)? I imagine that could be quite promising regarding the challenge of illiteracy. A very pratical guide of usability can be found here: http://www.masternewmedia.org/independent_publishing/usability-for-mobi… Although it might not be the one for rural areas in Africa. Best regards Christian