Airtel Double Data Offer 2019: How To Be Eligible

Right now in 2019 and you are still not enjoying the airtel double data ooffe, in Dbanj's voice "you're on a long thing". People are enjoying double data offer from glo, airtel and even mtn. But I can't say for 9mobile(Etisalat) as i don't really make use of them cause of high cost of internet data and