The cut in mobile call connection charges from 14 paise to six paise during the quarter added to the financial woes of the telecom giant.
Sunil Bharti Mittal led telecom firm had registered a net profit of Rs 503.6 crore in the same period a year ago.
"Regulatory fiat in the form of a cut in domestic IUC (Interconnection Usage Charges) rates has exacerbated the industry ARPU (Average Revenue Per User) decline in Q3'18," Gopal Vittal, MD and CEO, India and South Asia, Bharti Airtel said in a statement.
Established operators like Bharti Airtel, Vodafone and Idea Cellular are in the midst of a bruising tariff war after the entry of Reliance Jio backed by India's richest business Mukesh Ambani.
Reliance Jio's free voice and dirt cheap data offerings have dented the financial metrics of incumbent operators.
Still, Bharti Airtel's India revenue, which accounts for over 75 per cent of the total business, declined by 15 per cent to Rs 15,294 crore in the the period under review from Rs 18,012.6 crore.
The average revenue per user (ARPU) of Bharti Airtel in India declined by 28.6 per cent to Rs 123 in the quarter from Rs 172 in the year-ago period.
However, in terms of Indian rupees, the Africa revenue declined by around 4 per cent to Rs 5,129.3 crore from 5,355.9 crore on year-on-year basis.
The companys consolidated net debt rose to Rs 91,714 crore as against Rs 91,480 crore in the previous quarter.
Bharti Airtel invested Rs 6,465.7 crore in October- December 2017 period and installed around 32,000 mobile broadband sites in India.
"The company's Board has declared an interim dividend of Rs 2.84 per share, which is a complete pass through of dividend received from subsidiaries," the statement added.
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