Smart AppLock lets you protect any applications you want with PIN. You can lock: Whatsapp, Facebook, Twitter, Skype, SMS, Email, Gallery, Camera, USB connection, Settings and any apps you choose.
Face problem when :
A friend borrows your phone to play games with mobile data again!
A workmate gets your phone to look the gallery again!
Someone reads private data in your apps again!
Kids mess up Settings, send wrong messages, paying games again!
Then you must use Smart AppLock and avoid misuse