Airtel Value Offer, Airtel Welcome Offer, Airtel Unlimited FREE 4G, Airtel FREE Offer : After big war with Reliance Jio Now Airtel also Offering 4G Data and Unlimited Local STD Calling “Absolutely free” for 1 year. Get 36GB FREE 4G Data & Unlimited Calling with 4GB Data Per Month Limit. which is specially targeted for 4G handset users. Upon subscribing, users will get free benefits worth 9000 Rs till 31st December 2017. Offer is also valid for 3G customers but there will be limit on free data.