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This article explores the practice of "beeping" or "missed calling" between mobile phone users, or calling a number and hanging up before the mobile's owner can pick up the call. Most beeps are requests to call back immediately, but they can also send a pre-negotiated instrumental message such as "pick me up now" or a relational sign, such as "I'm thinking(More)
This study reports results of an ethnographic action research study, exploring mobile-centric internet use. Over the course of 13 weeks, eight women, each a member of a livelihoods collective in urban Cape Town, South Africa, received training to make use of the data (internet) features on the phones they already owned. None of the women had previous(More)
Rural communities in India are often underserved by the mainstream media. While there is a public discourse surrounding the issues they face, this dialogue typically takes place on television, in newspaper editorials, and on the Internet. Unfortunately, participation in such forums is limited to the most privileged members of society, excluding those(More)
Please use this pre-peer-review version for general reading only – for citations and particularly direct quotations please refer to the final and definitive version, available online from Wiley-Blackwell: (2010). A review of evidence on mobile use by micro and small enterprises in developing countries. Abstract The paper offers a systematic review of 14(More)
Recently, a variety of initiatives have been launched around the globe, which seek to use the mobile phone to provide financial services to the ―unbanked‖. These services take a variety of forms—from long-distance remittances of large sums of money, to micropayments, to alternative currencies where the stored minutes (or credits) in a handset replace or(More)
Spatial and temporal characteristics of a 128x128 zero-twist nematic liquid-crystal spatial light modulator are investigated for wave-front generation at a wavelength of 632.8 nm. The modulator is found to have the capability of producing at least eight phase levels between 0 and 2pi , and the rate of arbitrary phase modulation is limited to approximately(More)
Bandwidth caps, a limit on the amount of data users can upload and download in a month, are common globally for both home and mobile Internet access. With caps, each bit of data consumed comes at a cost against a monthly quota or a running tab. Yet, relatively little work has considered the implications of this usage-based pricing model on the user(More)
The battle against poverty is a continual engagement with humility-especially for technologists. In the area of research known as information and communication technologies for development (ICT4D), engineers work with social scientists to develop novel solutions to the challenges faced by the world's poorest communities. In most cases, these challenges(More)
Rural communities in India are often underserved by the mainstream media. While there is a public discourse surrounding the issues they face, this dialogue typically takes place on television, in newspaper editorials, and on the Internet. Unfortunately, participation in such forums is limited to the most privileged members of society, excluding those(More)