A penalty of Rs 550 crore has been imposed on Vodafone, while a Rs 300 crore penalty has been imposed on Idea.
The DoT had on March 15 slapped a Rs 350 crore notice on Bharti Airtel, India's leading telecom service provider, on the same grounds.
Bharti Airtel then approached the Delhi High Court, which issued a stay order on the DoT directive. The court had also said Bharti would not have to pay the penalty immediately. However, this stay order was lifted yesterday by a division bench of High Court.
The Supreme Court will now take up Bharti's case on Monday.