When I moved to where I currently live, I kept my old job for about a year and a half and worked totally remote. I found that dressing like I did when I was going into the office helped keep me focused on in the right 'work' mindset. I also made an effort to go walk around campus/uptown on nice days for lunches and as JDB mentioned, if it was just a telephone call, I'd do it on the move.
I traveled a lot for that job and the expectation was that I'd spend at least a few days in the home office per quarter, so the travel broke up the feeling of not being connected, but ended up being too much.
Post COVID I'm definitely hybrid and both in-office and at home dress has relaxed a bit.