Jan Chipchase and his user-research colleagues at Nokia can rattle off example upon example of the cellphone's ability to increase people's productivity and well-being, mostly because of the simple fact that they can be reached. There's the live-in housekeeper in China who was more or less an indentured servant until she got a cellphone so that new customers could call and book her services. Or the porter who spent his days hanging around outside of department stores and construction sites hoping to be hired to carry other people's loads but now, with a cellphone, can go only where the jobs are. Having a call-back number, Chipchase likes to say, is having a fixed identity point, which, inside of populations that are constantly on the move — displaced by war, floods, drought or faltering economies — can be immensely valuable both as a means of keeping in touch with home communities and as a business tool. [...]
[T]his sort of economic promise has also caught the eye of development specialists and business scholars around the world. Robert Jensen, an economics professor at Harvard University, tracked fishermen off the coast of Kerala in southern India, finding that when they invested in cellphones and started using them to call around to prospective buyers before they'd even got their catch to shore, their profits went up by an average of 8 percent while consumer prices in the local marketplace went down by 4 percent. A 2005 London Business School study extrapolated the effect even further, concluding that for every additional 10 mobile phones per 100 people, a country's G.D.P. rises 0.5 percent.
