{+[FEATURE]+} Bump of privacy/encryption issue

I see other issues mentioning encryption/protection (like #2, #54, #60 (closed)), but didn't see a definitive case against it. (Someone invited to look at Tiny Travel Tracker's privacy feature as an example.

Peoples private calls should NOT be accesible to other apps or an unwelcome user who got access to an unlocked phone.

I also recognize the this could be done with 3rd party apps, but not all users would be able to set up, or even see the need of, such protection.

Please help me understand why any such feature hasn't been implemented.

If not, thank you for all your awesome apps, may plenty of #insert_favorite_beverage come your way!