My siblings always borrow my phone either for playing games or to find discover stuff in it because they're nosy as heck. UC Browser has a picture password feature that can lock the app (and eventually delete all the traces, history, downloaded files if password has been tried incorrectly several times). The downloads can be saved in-app, meaning it doesn't go to your phone storage or SD card, it is part of the memory UC is using (unless you decide to export it to a storage device, which is another useful feature). So, when I have time to watch porn I just go straight into the UC Browser app, tap my password, open my hiding downloads and watch all the way! Love this app....
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