What's the best app protector? Strong password? Of course NOT. The best proector would let prier not be aware of any protection and it also can hide itself as far as possible. Invisible App Lock is one such protector.
When launching a protected app, it will throw a fake crash error which may mislead guest user into thinking that your app has a glitch or something. So it can stop guest from using your protected app in a natural manner.
But owner can clear it through several secret ways. It also provide a password protector with a secret input method.
** Important: How to Launch it **
This is invisible version of App Lock II, it will not show any icon on phone desktop. The only way to open it is dial "#999". But the dial launch may not work for some phone models, if you can't open it by dial the code, please try another version named "App Locker II Widget".
** About Widget Version **
If you can't launch it by dial, please try another version named 'App Lock II Widget'.
** Online Guide **
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