The two offers in reference are 'Jio Welcome Offer' and the 'Happy New Year offer'.
The petition by Bharti Airtel and Idea Cellular against the Telecom Regulatory Authority of India (Trai) order was listed for hearing today at the Telecom Dispute Settlement and Appellate Tribunal (TDSAT).
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During the hearing today, Bharti Airtel and Idea Cellular sought time to file their response to Reliance Jio's reply, and the matter is now scheduled for hearing on August 18.
Jio had launched the inaugural free voice and data plan in September last year, and in December, extended the freebies up to March 2017.
Following this, the established players — Airtel and Idea — moved the tribunal against the Trai order that allowed the Mukesh Ambani-led telecom company to provide free services beyond the stipulated 90-day period.
On January 31, TRAI held that Jio's free voice calls and data plan were not in violation of the regulatory guidelines.
TRAI had further said its examination had revealed that the 'Happy New Year Offer' launched by Jio on December 4, 2016, was distinct from the previous Jio Welcome Offer and could not be treated as an extension of the promotional offer as the benefits under both differed.
Reliance Jio started charging customers for its 4G services from April 1.