The successful bidders were given five years time to roll-out the 4G services by July 2015.
"CAG last week wrote to DoT seeking roll-out status of network by the successful bidders - Aircel, Bharti Airtel, Qualcomm (acquired by Bharti), Tikona, Infotel (now Reliance Jio Infocomm) and Augere," an official source said.
As per auction conditions, all of them have to provide 90 per cent coverage in metro area, if they has spectrum there, and 50 per cent of rural area within five years. If a company fails to meet roll-out conditions, spectrum will be taken back.
The BWA spectrum were allocated to all companies, except Qualcomm, in July 2010. Qualcomm was allocated BWA spectrum in May 2012 due to a a dispute with DoT which was later resolved in court.
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Airtel in October 2013 acquired subsidiaries of US electronic chipmaker Qualcomm, which had purchased spectrum in Delhi, Mumbai, Haryana and Kerala.
Till date, only Airtel and Aircel have announced partial launch of services using BWA spectrum.
Infotel, now Reliance Jio, is the only company to hold pan-India BWA spectrum but it is yet to launch its services.