Cashbox is new free recharge app in the android market. You can avail free recharge just by trying different apps from their offer page and referring this app to your friends through referral link. It supports all operator and both type of connections i.e. postpaid or prepaid. All you got to do is get the app on your device, login with Facebook or Google ID and complete offers to gain free recharge. It offers Rs 10 per referral.