"We are allowing all the petitions," said a TDSAT bench headed by Justice Aftab Alam.
The bench said that 3G ICR agreement signed by Airtel, Vodafone and Idea Cellular is not violative of licence agreement.
Airtel, Vodafone and Idea Cellular had approached TDSAT against Department of Telecom order to stop 3G intra-circle roaming agreement under which they had also agreed to acquire customers in area where they did not win spectrum.
DoT issued notice to Airtel, Vodafone and Idea on December 23, 2011 asking companies to stop 3G ICR within 24 hours and report compliance but the order was challenged by telecom operators.
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Tata Teleservices and Aircel too had signed 3G ICR but immediately called off their agreement after DoT issued notice to them.
Airtel sought access to Vodafone's 3G network in four service area- Maharashtra, Kolkata, Haryana and UP East.
Under the agreement, Idea Cellular secured right to provide 3G service using Vodafone's network in Delhi, Tamil Nadu, Chennai and Kolkata.
In July 2012, TDSAT gave split verdict where one of the bench member ruled in favour and other member ordered against it.
DoT again issued notice to telecom operators asking them to stop 3G ICR service along with penalty cumulatively amounting to about Rs 1,200 crore which was quashed by the tribunal.
Telecom operators then moved the Supreme Court against order of HC and sought that the case be transferred to TDSAT. The Apex court allowed telecom operators to move their case to TDSAT in September 2013.