The company -- which is headed for a merger with Vodafone India -- had reported a net profit of Rs 91.5 crore in the July-September quarter of the last fiscal.
"The operating environment for Indian mobile operators remained challenging with unrelenting pressure on pricing, introduction of Goods and Services Tax at 18 per cent (compared to service tax at 15 per cent) and need for large investments to support the exploding data demand," Idea said in a statement.
Its revenue from operations fell 19.72 per cent to Rs 7,465.5 crore in the July-September quarter of the current fiscal, from Rs 9,300.3 crore in the year-ago period.
Shares of Idea were trading 2.78 per cent down to Rs 94.35 a piece on BSE.
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The company said its while broadband data usage nearly doubled, the rate realisation "continued its free fall" during the three months ended September. The voice realisation rate fell by 9.9 per cent over the June quarter, and mobile data realisation fell more sharply by 49.2 per cent.
Idea's sequential quarterly voice minutes grew by 1.7 per cent to 255 billion minutes (against decline of 1.9 per cent in Q2FY17) and mobile data volume saw strong sequential growth of 73.5 per cent.
The company is "on course" to introducing Voice over Long-Term Evolution (VoLTE) -- a standard for speedy wireless communication -- by early 2018, the statement added.
Idea and Vodafone India have recently entered into active infrastructure sharing arrangement, to avoid duplication of spends and make best use of capex (capital expenditure), the statement added.
Besides, the depreciation and amortisation charge increased to Rs 2,114.3 crore and interest and financing cost rose to Rs 1,182.9 crore as the company continued to aggressively invest in expanding its 4G footprint, the statement added.
Idea's net debt as on September 30, 2017 was Rs 54,100 crore, including a large component of deferred payment obligation for spectrum acquired in auctions.
Idea and Vodafone have also decided to sell their standalone tower business in India to ATC Telecom Infra for Rs 7,850 crore. Idea will get Rs 4,000 crore (and Vodafone Rs 3,850 crore) from the tower deal if sale completion precedes telcos' merger.
The established telecom operators have seen locked in a fierce tariff war to protect their turf, following the entry of aggressive newcomer Reliance Jio in the market.
The incumbent operators have blamed competitive pressures triggered by the free and disruptive offers of Jio, for the financial stress in the sector.
India's telecom company Bharti Airtel posted 76.5 per cent fall in consolidated net profit to Rs 343 crore for the September quarter.
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