Jose
Oh wow sorry,
definitely get a new contacts app, gallery/photos, calendar (if you need it), and files app.
fossify has these
https://www.fossify.org/apps/
I don't know why contacts would be deleted.
Jose What are the differences btw the 2 last options exactly?
Charging only = you can only charge your phone batter with a usb cord. No data or information can be transmitted.
Charging only while locked = While locked, no data can be transmitted. If you unlock your phone, you can transfer photos and other things (careful of screen timeout locking it)
on = Data can be transferred all the time. (Set usb preferences for other options. Like usb controlled by this device i think means you'd have to allow usb connection for picture sharing.)