I was using this particular app from several month to get free recharge.
But now a days, this app is not giving credit for all apps that is being installed from Taskbusks.
At least I have installed three apps from this app in recent weeks and all those app were never installed on my device ever and was expecting free credit.
So, I was expecting credit after keeping apps for mentioned duration of Time, but on the day of getting Credit, it says that "it seems that you have Uninstalled the app", but that particular app was installed on the phone.
Pros: Credit can be transferred to the PayTm
Cons: You will not always get credit, and thus you will feel cheated for your effort and time.