It, however, said no tariff wars are expected as witnessed during the 2009-2013 period.
"The likely entry of new telco Reliance Jio, which is a part of Reliance Industries Ltd in 1H15 will intensify competition in the data segment, and may cause data tariffs to decline by at least 20 per cent," Fitch said in its 2015 outlook for Indian telecommunications services.
Reliance Industries had announced that it would launch commercial 4G telecom service of RJio in 2015 entailing investment of Rs 70,000 crore.
"We do not foresee a re-run of the tariff wars of 2009-2013, which led to a severe decline in industry tariffs," Fitch said.
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Fitch expects the top four Indian telcos - Bharti Airtel Limited (Bharti; BBB-/Stable), Vodafone India, Idea Cellular and Reliance Communications - to increase their revenue market share to around 83 per cent by 2015 from the current 79 per cent in the USD-30 billion industry.
Fitch said the top four telcos will generate a minimal free cash flow (FCF) margin due to higher capex and flat EBITDA; the 2015 industry capex/revenue ratio could rise as fast-growing data traffic requires supporting investment.