"We have held the impugned regulation to be ultra vires, arbitrary, unreasonable and non-transparent," a bench comprising Justices Kurian Joseph and R F Nariman said.
The apex court passed the judgement on the appeals filed by COAI, a body of Unified Telecom Service Providers of India and 21 telecom operators, including Vodafone, Bharti Airtel and Reliance, challenging the Delhi High Court order which had upheld the TRAI's decision making it mandatory for them to compensate subscribers for call drops from this January.
Refuting the allegations of TRAI that the telecom service providers are making huge gains in the sector, the firms had said they have been investing hugely on the infrastructure.
The Telecom Regulatory Authority of India (TRAI) had earlier told the apex court that it will take action against the Telcos for call drops to protect the interest of consumers as these service providers are not willing to compensate them.
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It had also told the court that a "cartel" of 4-5 telecom firms having a billion subscribers are making Rs 250 crore a day but not making investments on their network to improve services to check call drops.
The counsel for telecom operators had refuted the allegations of TRAI that telecom companies are not investing on technology and towers and had said that in past 15 months over two lakh towers have been installed.