ReCall: Crowdsourcing on Basic Phones to Financially Sustain Voice Forums

Although voice forums are widely used to enable marginalized communities to produce, consume, and share information, their financial sustainability is a key concern among HCI4D researchers and practitioners. We present ReCall, a crowdsourcing marketplace accessible via phone calls where low-income rural residents vocally transcribe audio files to gain free airtime to participate in voice forums as well as to earn money. We conducted a series of experimental and usability evaluations with 28 low-income people in rural India to examine the effect of phone types, channel types, and review modes on speech transcription performance. We then deployed ReCall for two weeks to 24 low-income rural residents who placed 5,879 phone calls, completed 29,000 micro tasks to yield transcriptions with 85% accuracy, and earned INR 20,500. Our mixed-methods analysis indicates that each minute of crowd work on ReCall gives users eight minutes of free airtime on another voice forum, and thus illustrates a way to address the financial sustainability of voice forums.