I am using paytm since 4 year for mobile recharge.earlier days I found found problem by recharging with paytm but with the change time paytm is gone to be much better and it is the best app of today for recharge.i have also used freecharge for mobile recharge but I found many problems like:-late recharge, recharge unsuccessful and many others application problems also.
But in the case of paytm I found it seal of trust.