This pre-paid offer will work like an advance recharge, meaning subscribers opting for it can use the same after their ongoing validity expires.
The offer -- which comes right ahead of Diwali and a day after Bharti Airtel's announcement of low-cost 4G smartphone with a bundled plan -- is set to generate more competitive heat in the telecom sector that has of late become a tariff battleground, especially after the entry of the new-comer Reliance Jio.
The offer, said the source, is for recharges between October 12 and 18, and a tariff plan revision is being planned from October 19.
When contacted, the Jio spokesperson refused to comment.
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Explaining the full cashback offer, the official who did not wish to be named, said Rs 400 cashback will come in the form of eight vouchers of Rs 50 denomination.
Bharti Airtel, India's biggest telecom firm with over 281 million subscribers, yesterday announced a tie-up with handset maker Karbonn Mobiles to bring a 4G smartphone at the price of feature phone, a move aimed at taking on Reliance's 'free' JioPhone offer.