Bandwidth connectivity is extremely low in many parts of the world, often delaying or even preventing people from accessing information. Although connectivity has increased by a factor of 10 or 15 over the last decade, average webpage size and number of objects has simultaneously increased by a factor of 60. This has resulted in what Subramanian terms an "unusable web"; the addition of video, audio and images has created huge web pages that take minutes or even hours to load in low connectivity worlds.

In his talk, Subramanian describes a range of techniques that he and his colleagues are developing to enhance information access in three scenarios of poor connectivity. These techniques illustrate the type of technologies being devised by a new group in Computer Science termed "Computing for Development." The focus of this group is on the design, implementation and evaluation of new computing innovations that enable global social and economic development. Since first world technology can often be a bad fit, this group instead seeks technologies that are locally appropriate, cost-effective, and easy to use.

The first low-connectivity scenario Subramanian discusses is that facing rural mobile users, who rely on low-end mobile devices and can thus only access voice and SMS services. To address the massive need for SMS services for this scenario, Subramanian and his colleagues have developed an SMS-based protocol stack for mobile applications that makes it possible to compress large quantities of information. The so-called UjU stack enables the compression of information into a 140-byte stack, while an affiliated UjU Create App interface enables anyone to create their own apps and forms. These forms are essentially turned into structured records (tables) that can be filled out and transmitted through a short message on a mobile phone. To date, UjU has already been used for microfinance applications in Mexico, mobile health data collection in India, and other applications in Ghana. Subramanian and his colleagues are also rolling out a live SMS search engine in Kenya and a data-over-GSM voice stack to support data connectivity over cellular voice.

Shared low bandwidth networks present a second low-connectivity scenario. In this scenario, an example of which might be a school where 2 Mbps of connectivity is used by 400 students, Subramanian suggests that a completely new Web architecture is needed. He and his colleagues have deployed an early version of such a system called Rural Café User Interface. Typically, a web browser sends dozens of requests when it is loading a particular page, since each site draws content from various sources and advertisers. Rather than being able to attempt to load as many windows and pages as possible, which results in even slower access, every user in Rural Café has a queue of what their search requests are. Users can search for anything at any point, but the interface acts as a planning tool by reporting how long (in seconds or minutes) the user would have to wait to load any particular site. The queue is persistent, so it doesn't change depending on how many new windows users try to open. This system is already being deployed in a few schools and universities in Kenya and India.

The third scenario is that of schools that have computer access, but no connectivity. To address this problem, Subramanian proposes the use of "vertical search engines" or contextual information portals that deliver a vertical slice of the Web in a hard-disk and provide an offline searchable and browse-able Internet. The portals are locally searchable and composed of many web-based services. Since the portals allow the user to search the local cache for the information they need rather than the URLs themselves, many local requests can be handled without browsing, supposing the local cache is strong and based on local interests and content. This is a good tool for either improving download times for people who have limited connectivity, or for enabling access for information for people without any connectivity at all. So far, the system has been piloted as an information tool for students and teachers in five schools with computers but no connectivity around Nairobi, Kenya.

Nathan Eagle, Founder and CEO of txteagle spoke at the weekly Liberation Technology Seminar Series on Dececember 2, 2010 about mobile phone usage in the developing world.

Although txteagle began in 2007 as a purely academic project, the current goal of the company and of its founder and CEO, Nathan Eagle, is to give one billion people a five percent raise. In his presentation, Eagle described the context for which txteagle was designed, how the company's focus has evolved over the past three years, and what steps the company is taking to move closer to achieving this goal in the future.

Eagle began by offering some background information to explain the initial impetus behind txteagle. Today, about 63% of global mobile phone usage takes place in the developing world, making airtime usage in emerging markets worth about $200 billion a year. Mobile phone users at the so-called "Base of the Pyramid" typically spend 10% of their income on mobile phone airtime. Through his experience living in emerging markets and teaching mobile application development in universities across sub-Saharan Africa, Eagle began to see that a significant opportunity space existed to reduce the cost of airtime for people at the base of the pyramid, in effect giving these people a raise.

Mobile applications developed as a part of MIT's Entrepreneurial Research on Programming and Research on Mobiles (EPROM) project offered some insights into the potential of mobile-based tools. In Rwanda, where electricity is a prepaid service, one of Eagle's former students quickly cornered a significant share of the market by creating scratch cards for crediting one's electricity bill via mobile phone. In Eastern Kenya, a program called SMS Blood Bank was created to enable real time monitoring of blood supplies at local district hospitals in Eastern Kenya. Although SMS reporting of low blood levels resolved the huge amount of latency in the system of local district hospitals (where responses to dips in supply had typically taken up to 4 weeks), the price of reporting blood levels via SMS represented a pay cut for local nurses; despite nurses' initial enthusiasm, SMS reporting tapered off within weeks. When the idea of sending about 10 cents of airtime to compensate nurses for each SMS report of blood level data proved a success, the model behind txteagle was born.

Designed as a means to monetize people's downtime, txteagle has grown rapidly through partnerships with over 220 mobile operators in about 80 countries around the world. In turn for helping these operators analyze their customer data, txteagle has gained access to about 2.1 billion mobile subscribers. Partnering with txteagle is a winning proposition for mobile operators, since the airtime compensation mobile subscribers receive from txteagle improves operators' Average Revenue per User (ARPU), a statistic that had been plummeting as more and more poor people became mobile phone users. By enabling people to carry out work via web browsers or SMS and compensating them via mobile money or airtime, txteagle has become a market leader at efficiently gathering data in the developing world.

Since txteagle was first created, the company has attempted to move from an outsourcing/back-office model to an emphasis on work that leverages a person's unique local knowledge and information. Typically outsourced tasks such as forms processing, audio transcription, inventory management, data cleaning, tagging, and internet search, tend to be less rewarding to the worker. By focusing on local data instead, txteagle enables unprecedented insight into emerging markets, all while optimizing engagement with local customers. Typical tasks include: maps and directions, local market prices and businesses, survey research and polling, and other forms of local knowledge gathering.

One of txteagle's central initiatives, GroundTruth, leverages this local knowledge-based model to carry out better market research. Today, global brands are already spending about $125 billion annually in emerging markets to engage the "next billion," but they typically carry out this research in a sub-optimal way. Through the txteagle platform, Eagle suggests, brands and organizations can use advertising money to design better products and services, conduct market research, and carry out brand engagement. Recent success cases include the use of txteagle to help a program of the United Nations to reach survey respondents directly and to enable the World Bank to obtain better local market price data at lower cost. 

Although txteagle's rapid growth and early successes have been encouraging, the company has ambitious goals for the next two years. The company began by focusing on outside sales through its GroundTruth market research program. Next year, the company  hopes to generate syndicated data and ultimately to create a self-source platform enabling anyone to conduct their own population-level surveys.  By continuing to focus on improving the quality of both their data and workers over time, txteagle aims to have an even greater positive impact on the incomes of the hundreds of millions of mobile phone users at the base of the pyramid.