Shares of Reliance Communications plunged 9.38 per cent to Rs 60.40 at the BSE.
Bharti Airtel dipped 3.36 per cent to Rs 384.35 and Idea Cellular was down 2.57 per cent to Rs 157.50.
These stocks had gained up to 4 per cent in early trade.
In a bid to ease telecom congestion, the government yesterday allowed companies to share airwaves in the same band so as to reduce call drops but did not allow leasing of spectrum.
"Fulfilling government's commitment to improve spectral efficiency and quality of service, which is very essential to fulfill the dream of Digital India, the Union Cabinet chaired by Prime Minister Narendra Modi, gave its approval to the guidelines on spectrum sharing, arising from the recommendations of the Telecom Regulatory Authority of India (TRAI)," an official release said yesterday.
Spectrum sharing would be allowed only where both the licensees are having spectrum in the same band and leasing of spectrum will not be permitted, it said.
With the Cabinet's approval, telcos will be able to share their unused spectrum thereby enhancing network quality and reducing operational costs.
Meanwhile, in a highly volatile trade, the Sensex today ended 37.27 points up at 27,549.53.
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