LOL - My grandmother once called me at college, an unusual thing since most calls were with my parents… initiated by me when I had time (but due to long distance expenses more often I sent a letter). Nanny sounded surprised, “what are you doing there?”. It turns out that she meant to dial my mother’s apartment but accidentally called my dorm room.
So the POL term is new to me. We tried to get son to do Sunday “heartbeat calls” (or emails), but that never really worked out.
In my mother’s later years, she started sending me daily emails with subject line by day. For example, on Sunday evening I’d get a “Sunday” email. It was good for knowing that she was OK while living alone. She’d waited a few paragraphs. I always replied, but sometimes only one or two sentences. For us that worked better than phone calls.