This offer comes as part of the company's strategy to attract more smartphone users on its network.

While Airtel has launched the data cash back offer for prepaid customers, the same will be extended to postpaid customers within a week, Bharti Airtel Director for Consumer Business Srini Gopalan said.

Airtel customers will get daily morning credit of 50 percent of data, be it 2G ,3G or 4G, that they will consume between 12 am to 6 am.

"Smartphones are going to drive Digital India. Person who provides best smartphone experience and services will ultimately benefit from it. Usage in night at telecom networks is least utilized. We are passing on to customers the benefit of low utilization time," Gopalan said.

Airtel has also extended 3G and 4G data sharing facility among family members for prepaid customers which was earlier available for postpaid customers.

To avail free subscription, Airtel customers need to download and start using Wynk application using their mobile network and later they can use it on Airtel wi-fi network as well. They just need to send an SMS to 121 or give a missed call to 55555 or log in to myAirtel app to opt in for the offer.

However, data charges will apply as per plan of customers on downloading music.

Apart from the data cashback and family data share, Airtel also launched the Smartphone Surprise offer.

Under this offer, customers who upgrade their mobile devices on Airtel pre-paid will be entitled to get gifts ranging from double data benefits, free data for up to a year, tablets, Bluetooth speakers, headsets, etc.

The offer is available for both existing and new customers and all pre-paid customers buying a smartphone from online portal Snapdeal will get additional onetime offer of Rs 750 off on the device.