NEW DELHI: State-run BSNL is going to revise its unlimited plans to counter Reliance Jio where the Rs 99 plan will be offering unlimited on-net calls and 500MB data for 28 days.Earlier this plan used to provide unlimited on-net calls, but only 300MB data. The Rs 339 plan will also be revamped where previously it used to offer unlimited calls to any network and 1GB of data for 28 days, and will now be offering the same unlimited calling to any network and unlimited data for 28 days with a daily data cap of 2GB.However, the Rs 339 plan will allow users to make unlimited calls within BSNL network, but the off-net calls are limited to 25 minutes per day, and after 25 minutes, each user will be charged at 25 paise per minute.BSNL is also offering unlimited calling and 1GB data per day for one year if they recharge within March, to counter Jio Prime memebership.In a bid to counter Reliance Jio, Airtel has also come up with new revamped plans to offer 1 GB 4G data per day bundled with unlimited calls.Airtel's Rs 345 plan now offers 1GB of 4G data per day along with local and STD voice calls free per month. This 1GB data will be available as 500MB on day time and 500MB on night hours.The telco has also modified Rs 145 plan, which now offers unlimited Airtel to Airtel calls (local+national) and 2GB of data with a validity period of 28 days.Airtel is also offering free 4G data to its postpaid customers under its ‘Airtel Surprise’ offer. It is offering upto 30 GB free 4G data to its postpaid users through MyAirtel app. Airtel postpaid users can avail the free data by clicking on the banner ‘claim free data’.