I have used freecharge app and site for mobile recharging.
I was impressed with the service because its very easy and clean UI and quick recharges.but recently the android app got crashing very often so I uninstalled the app and installed paytm.but website is cool and quick service. Overall freecharge is a very nice and vfm service for Indians.
They have to improve android app by the way in order to be number one because nowadays everyone using app only not website.