Most trusted recharge app named Taskbucks has come up with an offer in which you will get Rs 20 as signup bonus. All you have to do is download the app from playstore and signup for it. After successful signing up, you will get Rs 20 as paytm cash. You can also earn Rs 25 per referral by refering the app to friends. I have also written a post of how I made more than 3000+ Rs by using Taskbucks,earn talktime and Mcent app. Just check that out and apply each thing the same way taught there and then enjoy unlimited free recharge.
Note: You will have to download two apps after registering to avail this offer.