Bharti Airtel, under increasing competition from Reliance Jio’s free services, has extended free extra 10 GB data offer for three months for their postpaid customers. The free of charge extra 10 GB data offer or Airtel ‘Data Surprise Offer’ was initially available for postpaid subscribers till 13 April, 2017. The same offer has now been extended till 30 April, 2017 for the subscribers.