Get the latest .apk file of Lock for Whatsapp 4.3.6 free of charge and have a look at users' reviews on Droid Informer. You will need 17 MB of free disk space to install the app. According to the antivirus report, this application is safe and secure. Mobisec is the developer of Lock for Whatsapp which can be found in the Tools category.
The app is often downloaded by Samsung and Micromax users.