I will talk about applock app. Basically, this applock app deals with locking any kind of app which is present in your mobile phone. you can even hide pictures, videos etc. I am been using this applock app for quite a few years, this app is working good. But once I tried to hide the pictures and videos, after few days I had lost everything. I had no backup data also. I had just lost everything. So people who are downloading this app should try to have a backup of everything, so that whenever anything is lost, you do not have to worry about it.