Bharti Airtel's 4GB data per day offer is for prepaid customers. A customer also gets unlimited local and STD calls in Rs 999 Airtel recharge pack. Bharti Airtel, country's largest telecom service provider, is offering 4 GB 3G/4G data per day for Rs 999. The prepaid pack is valid for 28 days. Besides this, a customer also gets unlimited local and STD calls, the company said on its app, My Airtel. Aggressive data pricing by new entrant Reliance Jio - which offers telecom services under brand name Jio - has pushed the telecom sector into a highly competitive mode, with incumbent telecom operators announcing new benefits every other day, some analysts say. What Reliance Jio is offering at Rs 999 If you recharge your Jio number for Rs 999, you get 90GBs data at 4G speed for a period of 90 days. After one has used the pack for 90 days, the data speed will reduce to 128 kbps. One also gets unlimited SMSes (short message service) and unlimited free voice calling in this pack. Oth...