Secure your android.7. (stability, counterintelligence, reliability). Soft?

Question

Android

There is an android 7. 1GB RAM.
what software to protect data (especially contacts and videos and photos) when you forget your smartphone at work?
What software will theoretically help
to increase stability and anonymity and secrecy and security on Android 7?
firewall? camera and phone blockers?
Cancellation of google account and google play? proxy? traffic encoder?
special browser and special messenger?
what to backup? what software to protect data (especially contacts and videos and photos) when you forget your smartphone at work?

Answer 1

Encryption of the partition, if it is not supported by the standard (look in the settings) means you have a long and thorny path towards flashing to something like lineageos (the best currently open firmware)
Encryption is data read protection if an unencrypted device falls into the hands to an attacker (he will be able to launch some twrp using the service menu and copy all your files).
Also, when you turn on encryption, you will need a lock code (pin, pattern or password) - it is required and should not be simple, otherwise even a full lamer will be able to unlock it with some 1111 pin and read everything.
There are a lot of other tips, but they relate to situations outside the default, such as you allowed debugging via usb (opens full access to the phone) or over the network without asking for permission (retained permission to access from a working computer over the network), etc.
These very simple actions will greatly complicate the life of an attacker, so much so that the cost of accessing data can skyrocket, and here the protection of the elusive Joe is already at work.