Dear Friend's,
I can say AppLock is one of the best app till now I have used. It provides me security against each and every files or any apps installed on my phone.
The best part is it is very lightweight and gets easily installed on your phone without any charge. The app has a facility to apply themes from various in-built themes. You can keep various techniques to secure your file like pattern lock or lock using pin.
If you forget your password then no need to worry you can easily retrieve from your registered email id. I truly enjoy using this app and now I can share my phone with anyone without worrying about my data.
Thanks
