If I can’t use it one-handed (using ALL physical buttons and ALL parts of the screen), then it’s not a phone.

Seriously, this is how we used to define the difference between phones and tables - one-hand or two-hand use.

Great.

1: How do I get an RTSP or ONVIF? Every time I try to buy one, the stuff that is recommended is no longer available, or practically only available in US. (I haven’t checked in months maybe years, but this is where I usually get stuck.)

2: So I get a camera, and I have an rpi or PC-based server with storage. I can see a stream, but that’s just an extra eye. How do I turn this into a surveillance camera, so I get a notification when there’s movement, and an archive of people in the monitored area?