There are lot apps that gives free recharge like tasksbucks, earnt talktime, ladoo., and lot of other apps that gives free recharge for downloading apps on to your smartphone. mcent is first of this lot and gives lakhs of free recharges at one point of time they gave 300-900 for every refer which create it a leader in this field.they introduced daily lock in for their apps. you can earn rs1 daily just by signing in. best app try if u didnt try upto now