Shares of Bharti Airtel plunged 5.99 per cent to Rs 461.45 on BSE.
The scrip of Idea Cellular tumbled 6.48 per cent to Rs 92.95 and Reliance Communications lost 2 per cent to Rs 28.60.
Idea shares were also under pressure amid earnings disappointment.
Idea Cellular today posted deeper losses of Rs 1,284.5 crore for the quarter ended on December 31, 2017.
Stepping up the tariff war, Reliance Jio has decided to offer 500 MB extra data to its subscribers using 1GB and 1.5GB per day data packs with effect from January 26, company sources said yesterday.
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"Jio will always offer more value to its customers, and offer Rs 50 lower price than competition and 50 per cent more data on its plans. As part of Republic Day offer, all existing 1 GB per day packs enhanced to 1.5 GB per day, 1.5 GB per day packs enhanced to 2 GB per day," sources added.
Bharti Airtel had recently introduced Rs 399 plan offering unlimited calls and 1GB 4G data daily with 84 days validity.