The document summarizes the findings of a large survey conducted in India in 2010 that studied mobile phone usage in the country. Some key details: - The survey covered over 250,000 individuals across both urban and rural areas in all 22 telecom circles of India. - It provides estimates on the number of mobile subscribers and devices in India, as well as profiles of users including demographics, mobile usage behaviors, and lifestyle preferences. - The survey findings are presented in online datasets with data at the all-India level, urban/rural levels, telecom circle levels, and individual city/village levels.