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Bharti Airtel Limited, commonly known as Airtel, is an Indian telecommunications services company headquartered at New Delhi, India. It operates in 20 countries across South Asia, Africa and the Channel Islands. Airtel has GSM network in all countries, providing 2G, 3G and 4G services depending upon the country of operation.
Airtel is the world’s fourth largest mobile telecommunications company with over 261 million subscribers across 20 countries as of August 2012. It is the largest cellular service provider in India, with 186.41 million subscribers as of October 2012. Airtel is the third largest in-country mobile operator by subscriber base, behind China Mobile and China Unicom.