Just recently, we heard about a m-gov application in Indian villages which uses barcode readers from Subhash Bhatnagar. The Economist has a long piece on how barcodes and mobiles interact.
NEGOTIATING his way across a crowded concourse at a busy railway station, a traveller removes his phone from his pocket and, using its camera, photographs a bar code printed on a poster. He then looks at the phone to read details of the train timetable displayed there. In Japan, such conveniences are commonplace, and almost all handsets come with the bar code-reading software already loaded. In America and Europe, though, they are only just being introduced.
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