Data privacy is an issue of concern in Smartphones. There are methods to secure this data. I had earlier described methods to secure your data which is explained in this article. But these methods lock your entire device, and it can get irritating sometimes to unlock your device time and again. However, there are ways to individually lock apps on your android. Here is described a simple app called Smart app Protector that helps you to lock individual apps. But you need to do a little configuration before you can start using this app.