The company reported a net loss
of Rs 8.15 billion ($127.13 million) for the three months ended June 30 after posting a profit of Rs 2.20 billion a year earlier.
Analysts on average estimated a loss
of Rs 6.71 billion, Thomson Reuters
I/B/E/S data showed.
Idea's capital expenditure guidance for the full year 2018 is Rs 60 billion, it said.
Reliance Industries, led by India's wealthiest man Mukesh Ambani, entered India's telecoms industry last year, spending more than $30 billion on Jio and upending the sector with its low-cost data plans.
The ensuing price war
has triggered consolidation in the world's second biggest mobile phone market by users.
Idea and Vodafone Group Plc's have agreed to merge their Indian operations in a $23 billion deal that is expected to close in 2018. Bharti Airtel is taking over operations of Norway's Telenor in six Indian states.
This week, bigger rival Bharti Airtel reported its smallest profit in 18 quarters.
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