I've had apps I've used before that made themselves invisible unless a chosen or preset dialcode was typed into the phone app. Can you do that with any app, and if so, how?
I'm thinking something more sophisticated than that, I think. Basically, if I wanted to put an app that notifies me if any of my files are deleted but I don't want anyone who uses my phone to be able to delete it or see it, how to hide it from even system files. I'm not sure it's possible.
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