How to Get 100% Cashback on Prepaid Mobile Recharge: 1) First of Download/Update Paytm Application 2) Install And Open the Paytm App. 3) Click Mobile recharge Option. (Make Sure Your Number has not been Recharged on Paytm before). 4) Proceed to Recharge 5) Apply Coupon:- CDFIRST or GFIRST or PFIRST 6) coupon code get applied successfully. 7) You will get the 100% cashback upto Rs 55 Cashback instantly.