Technologies such as contactless card payments, allowing you save a few seconds when you buy a coffee, are sometimes seen as frivolous. But is the real value of these technologies more likely to be in helping developing countries to progress?

We hear how tablet computers are giving Nigerian farmers easier access to subsidised fertiliser and seeds, even in very remote areas. And we learn how smartphones could soon be saving eyesight in Africa and Asia.

Presented by Jane Wakefield, with special guest Ken Banks, the anthropologist and mobile technologist founder of Kiwanja.net, and Dave Lee and Mark Ward from the BBC online technology desk.