well my intention of the questions is not "to be invisible" but to know on which layers are the security and the visible options, that is, to know that if I disconnect the gps from settings, that an app cannot turn it on. I have to document myself before making any app,
I understand that it is something normal being an "open" system compared to android or ios.

@arubislander thanks for the information, I'll review the information to see if it helps me or I can start somewhere... thanks.

@arubislander ok, That's what I meant, that if the device deactivation settings (in OS settings) did reach the deepest layer...

to be able to manually see and manipulate those factors, how can I see the OS code and manipulate it, compile it and so on... Is there a tutorial or guide or something where I can start to investigate? thank you so much.

Hello everyone, thanks for your answers.
It is interesting to see the applications and the code (even if it is to see how they access parts of the device for security reasons) but the problem I am having is creating a custom rom for the company and making sure that if I remove the gps option (I put that example because I think it is the clearest) if I remove gps from the options,
that no app (legitimate or by hacker) can turn on the gps on their own...

more than a problem is a doubt.

I would like to know if there is a way to make a package of the rom in which the gps is disabled.

Also know, if from settings I remove the gps, if there is a way for any application or permission to bypass that restriction and reactivate the gps.

My example is that I deactivate it for privacy, and if they attack my mobile
, if an external attacker, either through other methods or through an app, can connect the GPS and obtain the location.

(This is extrapolated to other device sensors such as camera, gyroscope, sim...)