ByShare this storyn 2003, Praveen Kumar bought his first mobile phone, as several of his friends already had. But for the 29-year-old schoolteacher from the eastern state of Bihar, one of India’s poorest, to use the device to talk to his friends was inadvisable. “It was very costly,” Kumar says. Each outgoing minute was charged about eight cents, so a 10-minute call cost about as much as the average daily wage at the time. “We didn’t have enough money to say everything on the phone.”So Kumar’s friends and family members began ringing each other but hanging up before being charged for a...…ByShare this storyn 2003, Praveen Kumar bought his first mobile phone, as several of his friends already had. But for the 29-year-old schoolteacher from the eastern state of Bihar, one of India’s poorest, to use the device to talk to his friends was inadvisable. “It was very costly,” Kumar says. Each outgoing minute was charged about eight cents, so a 10-minute call cost about as much as the average daily wage at the time. “We didn’t have enough money to say everything on the phone.”So Kumar’s friends and family members began ringing each other but hanging up before being charged for a...WW…