Amulyam is a good android free recharging app with the help of which you can recharge your prepaid mobile sim for free. I have also used this app and recharged my mobile several times. To get free recharge you must have an android mobile and working 3g or wifi internet.
Then you have to download this app from the google playstore and after that you can start earning free recharge. The main concept is that you have to download various android apps which are listed within the amulyam app.
Once you click on an app from the list you will be redirected to google playstore to install that app. After installing it you must browse that app for few minutes to get the reward for it. Some apps offer like Rs 5/- and some apps offer Rs 10/-, etc. After you reach the minimum redemption amount you can recharge your mobile with that amount. So overall its a nice android app to recharge a mobile for free.