Both. My standard phone defacto already is a burner phone, so I'd just either wipe it or pick something new up when travelling to that kind of countries.
Similar for a notebook - I'd travel with an empty one, restore it after arriving, and wipe it again before leaving. I have infrastructure in place to make that easy and secure for me to do.
Similar for a notebook - I'd travel with an empty one, restore it after arriving, and wipe it again before leaving. I have infrastructure in place to make that easy and secure for me to do.