Kill Airtel xtream
Please don't confuse others. still I am getting same error " Recharge your account to use any application".
Go to settings ==> apps ==> Airtel xtream ==> Force stop
press back button ==> you can lunch any applications from here. ( if you want you can lunch play store and install A-launcher, I am using now).
Dont press home button, it will launch airtel xtream app, then you need to follow above steps to force stop the xtream app.
you can use button mapper to configure home button to new launcher, you-tube, Netflix,
amazon prime buttons. other wise this buttons are useless.